I have the Mufflex with Magnaflow muffler. It's loud!! lol

I could possibly be ok with the sound but its just down right unattractive. I have it on a Formula (no skirts to hide it) which doesn't help. I'd planned on cutting the tip back so that it doesn't show as much and having the tail pipe and muffler powdercoated black so it doesn't stand out as much.

How does everyone feel about their exhaust?

Shew!! I'm exhausted..... lol


I have lots of bad jokes!!

 

Hey neighbor.
I have been looking at both the 3.5 & 4 inch version with the Magnaflow just recently. It will be going on a camaro so should be fine for me.
I thought the Magnaflow was fairly quiet until WOT?
Post some pics.

 

Hows it going neighbor?

I'll get some pics today to show what I'm talking about.

As for the sound, at 2500-3000 rpms, its LOUD!! You can be 1/4 throttle or full throttle. When the engine is not at operating temp it sounds like a glass pack at that rpm.

I'll try to get some vids with my phone while driving. Don't see it being very good though.

 

I wonder if the pipe being 4" might cause the system to be louder?
but yeah, defiantly post some pics and a clip when you can.

 

They look like the tail pipe on a school bus. Just hanging out there in the wind, not a care in the world for how they look.


Sorry.

 

Not a mufflex. I built my own. If it helps

https://www.thirdgen.org/forums/exha...de-4-inch.html

 

LOL!! No need to be sorry Drew. That's actually what it looks like.

2slow5.0, I really like your set up. Are those 2.5 or 3 inch tailpipes?

Do they still make 3 inch factory style tailpipes?

 

3 inch tailpipes. I dont think factory ever made bigger than 2.5

 

There was the 3" Flowmaster tailpipe the mufflex is modeled after, it looks exactly the same just in 3". Only plus was 3" is easier to tuck up under the car.

 

mine are flowmaster tips. 3 inch all the way vs
2 1/2 on most. I just liked the basic look of flowmaster tips.

 

Hmm, last time I looked I thought the flowmaster tail pipes were 2.5... Are they a 82-92 part or 93-whatever part? It's been awhile since I looked, seems like Flowmaster didn't want to sell any of their components separate except for the mufflers.

 

Yes sir, 3 inch all the way. I have same tips on my 3rd and 4th gen. I bought 1 set on here used and 1 set over on ls1tech. So you may be right on buyin em from the master seperate

 

Just looked at Flowmaster's website. Looks like the catbacks they sell now (single cat only) both use 3" pipes. I must have not looked closely enough at the diagrams before. They list some tail pipes for some applications, but I can't find anyplace in a quick search that sells just the tail pipes.

 

you can carefully trim the pipes to tuck them up higher in certain places for a slightly better fit. This is on my sport coupe except I run the S


pintech on my 4" Mufflex

 

I'm hoping to be able to redo mine when I pull the rear.
How do you like the Spintech?

 

4.5 inch mufflex here with a 4.5 inch 2 chamber flowmaster...

 

The SpinTech reminds me of a custom Flowmaster type muffler, similar in sound. I Installed this years ago replacing my 3" Flowmaster setup so I wanted a that sound. Now I have recently been considering switching to a Borla muffler to change up how it sounds but it all comes down to personal preference

 

Idk if it matter to others or not, I was running a 3 inch spintech, switching to the 4 inch with dynatech muffler picked up a huge sotp improvement. I swear 50hp but i have no dyno to back it up

 

But unless you mistyped those sizes you went up an inch in size so I’m assuming a likewise increase in pipe size which largely makes the muffler manufacturer inconsequential. Huge difference from a 3” exhaust to 4”.

 

I've got a 4 inch Mufflex kit with a Flowmaster. Yes, it's loud. I'll get some pics up when I get a chance. I agree that the tailpipe is just hanging out there.

 

I just installed mine a few weeks ago. I’m using the Magnaflow supplied with the Mufflex kit, but I managed to tuck the system enough to run a 6 inch OD dynomax bullet muffler to take the bite out of it a little. I have a stage 4 cam, so a 4 inch system was a pretty bad idea on a daily-ish street car. I might experiment with a diesel muffler in place of the Magnaflow eventually. Hell if I ever managed to make it TOO quiet, I can always add a cutout. Also before the Magnaflow I had a Hooker quiet flow as you can see below. Quietflow my ***, the magnaflow ended up being quieter so I swapped it out.

 

I just ordered the Hawks sinister... if it ever ships geez. I also ordered a vibrant 15” case muffler and hope it will help tame it. I have a 3” mandrel catback with a single 3” offset borla pro XS muffler and it’s too quiet. I also run a cutout before the catback which I open up for power as I have a single turbo 5.3. My tests show over 2psi drop in boost with the cutout closed and exhaust pushing 3” from the turbo out the tail pipe. If I open the cutout it’s 2-2.5 psi increase with no changes. Plus I get lots of turbo spool with the cutout open, close it and the turbo makes no noise. I hope that my turbo helps quiet the exhaust as well in conjunction with the vibrant muffler. The muffler is on back order till middle of next month so I’m literally just waiting for parts to eventually ship. I’m hoping the 4” catback will help bring some turbo spool noise back and take a bit of the edge off compared to the cutout which really isn’t all that bad honestly. The 3” catback just kills power tho but it also quiets the car down a lot.

I personally like the hidden tip approach and I’m going to cut and tuck the 4” outlet as best I can when it gets here.

I’ve tried looking for oval case mufflers in 4” with offset inlet outlets but I want straight through perforated core. Aero chamber is ok, but I would like stainless and the biggest case I can fit to help with the noise. Been trying to find a 20” dynomax ultra oval is impossible.

 

I have the 4" mufflex, with spintech muffler. Regardless of the muffler you pick, it's pretty easy for an exhaust shop, (or you, if you're so inclined) to hide the tips. Sound was awesome with that muffler, but it was actually a little restrictive for my engine. I decided to make a more race oriented setup, and welded v-bands on the over axle pipe, spintech muffler, and the new tailpipe I made out of some scrap 4" stainless and a vibrant 4" muffler. The outlet is fairly hidden. Its way too loud to be practical, but I'm adding turbos and hoping it tones it down a bit. Swapping mufflers takes less then 5 minutes this way.

 

My hawks 4” sinister catback finally shipped, should be here Thursday. Ordered a 7”x18” round case vibrant muffler thats 22” long and going to see if that fits. All the pics show the pipe hanging down quite low in relation to the heat shield below the gas tank. Is there a way to tuck it up higher? A 7” round case is a big boy lol. I still have my vibrant oval 15”x9x5 case and 20” overall muffler on back order of this one doesn’t work.

does anyone know where the hawks catback ends by the trans? My 3” cutout is under the pass seat and want to make my connection right by where the cat detent is under the pass seat... basically I have a Vband I could swap out and connect right by where the floor board drops down after the cat. Don’t know if I need to cut the hawks or extent it so I want to have what I need before hand.

 

Got my muffler today, fedex is late and looks like the catback will be here tmrw.

last night I removed the 3” catback and added some adhesive heat barrier to the gas tank and behind the rear seat. I’ve never had an issue without anything before since I don’t have that heat shield at the back of the floor behind the pass rear seat.

this muffler is very nice, she’s a big girl too lol. I hope it fits, here is the comparison compared to the 3” inlet borla proXS 14” case. I have the oval version on back order if this doesn’t fit.

 

Got the system today In case your wondering it’s the hawks 4” sinister catback. Opened it up and the over axle pipe has a mufflex mount on it! Looks like hawks is just using the mufflex parts in there kits... I’m not mad about it either!

Spent 5hrs (lots of time making it purdy and fitment to my turbo down pipe. Ended up with more ground clearance than my 3” summit catback. The summit catback the over axle part is all 1 formed piece so in order to get it out I had to drop the rear axle, unbolt the PHB and PHB support... annoying. Summit over axle piece didn’t give me a lot of over axle clearance either and was never impressed with how it fit. This Hawks sinister kit fit like a damn glove! Over accel has more room over the axle and I have like 1/8-3/16” clearance between the PHB support and the exhaust. How they managed to figure that out must have taken a while but I can’t be happier with the fitment. Installed and wrapped the vibrant 18” case 22” overall muffler which fit without trimming and it cleared the muffler heat shield. I had the header wrap and I hate chrome/polished SS so I wrapped it vs painting it. I made my own tail pipe mount and bolted it up bright and tight to the underside. I’m fine with the fitment and how it looks but I won’t know for sure till I can start it and get it out in the driveway and get a good look. I painted it back to hide it tho in the mean time. I haven’t started it yet (1am now) so hopefully it’s not as loud as I think it’s going to be lol. If it’s good, I’ll drive around with it for the summer, see how it sounds and If I can tolerate it I will pull it again in the fall /winter and give it a good coating of creakote. I just don’t want to invest that time if I can’t stand it. Think I’ll start an install thread if u guys want to check it out.

FYI my car is not stock lol in any form and I have 18”
rims, drag radials on the back 27.7” tall and 26.7” tall front tires, weight jacks all around with 850 front and 175 rear springs. My car looks lowered but I have a 29.25” rear quarter height and 27.5” front fender height which I believe is around the stock height. Do ground clearance will be different on a lowered than stock height car. My lowest part is my deep trans pan.

 

This was with the summit 3” catback.

 

Started it up and shocked by how quiet it still is. Here are some videos. These idle shots are outside in the same spot so the sound should be close (nothing to echo off of)

here is the before video with the borla proXS muffler idling.

here is the after video with the 4” catback


Driving the car down the highway with 4” catback

honestly I took the car out for a drive and the car is much quieter than I thought. It’s louder than the borla 3” but not as loud as I was expecting. I was able to get alittle more turbo spool through the full exhaust but still nothing compared to what the cutout provides. Overall the car is still pretty quiet and I can cruise down the road with the windows down and not hear the exhaust much. Depending on how I feel I can always do a muffler delete or put something smaller in

 

Sounds good sometimes videos are hard to capture sound .. I see your in NJ where abouts so are we..we in the piscataway area.

 

Lived and grew up in Essex county -west orange NJ. Last year I moved out to CT bc NJ is getting out of hand price wise. Just recently got a job in CT as well, but I still have a property in NJ so I’m keeping the NJ license. I haven’t changed the plates bc CT has the yearly DMV fees and combined with my new truck I’m saving a lot of money just keeping everything in NJ. Prob going to drive the car into NJ tmrw to visit my parents tho. Lots of good car shows in NJ... haven’t gotten that far up here.

 

I grew up in Belleville moved to wayne in the 90s now live in South Plainfield yes tons of car shows around here..have you raced your car what tracks did you go to? Maybe when day will meet up..were building a 89 iroc with a 383 stroker first performance intake and holley hp efi system we have a mufflex 4.5 inch exhaust that mufflex did for us..great shop.

 

PM sent so we don’t derail this thread. Did you mean 3.5” or does mufflex produce a 4.5” exhaust? I guess it could fit pretty easily with a PHB relocation kit.

 

Customblackbird,
My over the axle pipe is a little different than yours. I pulled the rear yesterday and you can really tell how much the exhaust hangs down. I'm looking at getting a longer muffler to try and quieten it down a little. The magnaflow muffler case is 16 inches.

 

yours looks a good bit lower than mine. Mine is a 7” DIA muffler and I have less than 1” between the muffler and heat shield. So if you measure the top
edge of your 4” OD pipe that would be 2.5” from the pipe to the heat shield. If I had to guess with yours your closer to 4”-5”. With the 18” case on mine the exhaust is pretty quiet, but I have a turbo that helps. Dynomax has the perfect muffler, ultraflow perf core but offset inlet/outlet but I think the case is 25-30” and that would be perfect if the muffler could be shortened.

 

Doesnt borla makes good mufflers like the XR1 for turbo applications

 

yea, they are straight through perf core... $218. You would have to cut the pipe tho as the XR1 is bigger if I remember but I was able to fit 22” long on mine. My vibrant was $105. If u got the funds it would prob sound the same as a Vibrant or maggy of
equal dimensions. Prob just slightly different tones from different internal packing. Most straight through are just very deep sounding.

 

We are using a 2 chamber flowmaster lol

 

for those of you wondering my smaller oval case vibrant randomly shipped 3 weeks early from Jegs and arrive today. It?s a 5x9x15 case with 20? tota
length however it?s really 5.5?x9?x15? and a 19?
overall length. The way I fabbed the exhaust it fits the 22? long 7? DIA round muffler better after test fitting tonight. The smaller vibrant is a direct swap for the Hawks muffler delete pipe (same 19? length) and it?s a good bit cheaper than the maggy. The 7? round only hangs .75? lower than the oval so im fine with that and its not lower than my rear. I did not like how much gap is above the oval muffler than the heat shield... almost wished I could tuck the over axle pipe up higher and if I could then I would run the oval smaller muffler. I def picked up power over the 3? catback and got alittle more turbo whine but still
nothing compared to the cutout being open. got nothing bad to say with this hawks/mufflex catback, lots of ground clearance and great fitment.

 

Good deal. Great info for someone looking to go with a 4 inch exhaust.

I'm going to cut my over the axle pipe and get the muffler closer to the heat shield.

The magnaflow muffler that is on mine is actually 14 inches in length and not 16 like I previously stated. Does anyone know if a Flowmaster Delta flow race muffler would be quieter?

https://www.summitracing.com/parts/flo-54031-12

 

I can see you being able to tuck that up a good bit... maybe even just a small bend (weld in a 15* bend section or something) to push it up like a small pie cut.

Flowmaster will hurt flow but my understanding and experience with chambered mufflers is they are louder all around. They dont do $hit for canceling sound waves and all they do is hurt flow. Straight through are quieter at idle and low rpm but get louder as the RPMS increase... idle is a DEEP tone and not loud/crackly like a chambered. Your best bet to quiet will be a muffler with internal packing to absorb sound waves. Your only going to get that with a straight through or turbo style muffler config. I doubt you will find anything in turbo style at 4" and in the space constraints. I think a larger straight through would work better and quieter. I think you just need more muffler to help. The vibrant I'm running would drop in more than likely and its 18" case vs your 14" which is 4" extra (even though the inside is only 12" open perf core). Or you can run another muffler as a tip. I did that with a dynomax ultra flow straight through and run both mufflers together to get more case. Below is a pic of the 4" exhaust I made with a 14" case hooker max flow in the stock location (i was running a sumped stock tank) and a dynomax round as the tip/tailpipe.

 

You have Any sound clips?

We have a 4.5 inch mufflex exhaust and we use a 2 chamber flowmaster its huge i dont see how that had a huge restriction it could i.guess..

 

don?t think I do of that older setup. It was fine at idle, nice deep tone and not loud. But above 2000-2500 it would get loud but that?s when the car had a supercharger and was LTs into dual 3? into a 4?
merge and 4? all the way back. I got rid of it bc of the sound on the highway it was too loud for cruising but had no drone or resonance etc.

look into the Flowmaster and let me know if u can see through to the other side lol. I bet you can?t and that?s the restriction. They put metal plates in the way and make the exhaust go around and through paths to create sound waves that cancel themselves out. Compare that to what I posted... straight through tube and tell me which one is more of a restriction lol. There are proven Dyno sheets of how much power a Flowmaster will restrict. One guy flowed a super 40 vs a straight through of the same size and saw a 220cfm difference. Some guys report 30+ hp switching from a flow master to a magnaflow or similar straight through design on our specific style of car. I know Steve Brule from west tech did a test and on the top end they all made the same ish Hp but big differences under the peak tq.
https://ls1tech.com/forums/dynamomet...they-suck.html

 

Very interesting I'll do some research I wonder how a spintech muffler is compared to a flowmaster?

 

Spin techs sound good but they are also restrictive, they have a bunch of wound perf core "twisters" inside them (you can see the welds on the case) and they make the exhaust spin through them and they force through the core of the twisters. But bc they are in the path of flow they restrict it like a flowmaster. People tend to pickup a bit of power going from them to straight through perf core. They are also very heavy compared to a straight through design.

 

yeah I know the spintechs are heavy maybe I'll throw a cut out on it before the muffler run it open at the track

 

Thats usually the best and cheapest option. I run the cheap ebay single 3" and its worked great for years. I got a replacement valve/butterfly a while back for like $25 for the whole unit if the original decides to take a dump but it hasn't. On my setup the cutout is worth a solid 2.5psi and at least 50rwhp before with the smaller 3" catback... prob worth alittle less now with the 4" catback.

 

which type should I look To get? A certain brand

 

THey all kinda work the same. If you look closely the summit brand/granelli brand are just relabeled ebay kits that are more money. QTP or Dougs are higher end brand and depend son what you want to spend. Badlanz on ebay is better quality and not that expensive. This is the ebay style I run but mine was the option with a 3 pole manual switch and not the IR key chain button style. You can search and fine them... looks like holley is rebranding the same one but selling for $200+.

Ebay
https://www.ebay.com/itm/3-Inch-76mm...AAAOSwj~tdnEXQ

Bandlanz (this is the weld in version but they sell the Ypipe version as well in there store. Guy has a great warranty.
https://www.ebay.com/itm/NEW-Electri...Y/173252316838

 

shortened the over axle pipe, trimmed the tailpipe and painted black. Pic is terrible!

 

looks like u were able to tuck it up a bit! Looks better.