i need some suggestions on how to quiet my car down without restricting flow. it's currently a single 4" exhaust setup with a 2 chamber style spintech and no emission pieces.

There's no such thing.

But if you really want, a high-flow converter will do it.

Yup, a high flow cat will tame the sound some.

to loud? come on now....

a different muffler like dynomax or something else quiet

i couldn't do that because i want the power and tone....just at a lower note if possible.

you have to remember i like to take the car out on nice nights. not to much fun when you setting off alarms and being followed by police just idling.

that is when it idles.

I have the same problem, unfortunatly not the same car.


I think Resonators do the job. monza Pacesetter sells them, I think i'll try them.

if it makes you feel better, i got stopped for loud exhaust a few nights ago with the flowmaster

This is it

i need to do something in between the headers and the muffler. i couldn't really change the tips as i don't have one and would prefer it that way if possible.

pat i thought i warned you about that.....i wouldn't mind putting that old system back on to see the difference i gained as i never had the chance too.

I would vote for a high flow cat, but I've never seen one in 4". Hmmmm...
A giant cork???

Troy
So Cal

lol....if it's high flow why not?

yeah i've never seen a 4" cat either and would think there must be something better. maybe i could adapt a resonator in the mid section some how. i know my gtp had one on the car but it was very restrictive.

Why not just put a dynomx or magnaflow on there? They have fairly quiet mufflers that still flow good. But then again, with a 4" setup, how quiet are you planning?

well the engine itself is loud, i'm not expecting to have the thing go in stealth mode. i'm just trying to figure out alternative meathods to keep what i have but modify somehow to quiet the car down.

once in awhile it's all fun and games to see old ladies jump as your cruising next to them but it gets old after 20 min or so when you can't hear any more.

if gm can have 1,000 hp vettes that you can hardly hear it must be possible. maybe i'll have to go to a smaller exhaust....

I don't get it? You want it to quiet down, but you dont want it quiet? Like others have said, you need a quieter muffler, plain and simple. An electric cutout could be used for those times you would like to "scare old ladies." If you refuse to get a different muffler then I don't know what else to tell you. Live with it then. Those vette's you speak of prolly have a quieter muffler.

actually they use corsa which is louder......but that doesn't matter.

thanks for the opinions.

if you're runnin without tips, that does make the car sound louder. my friend with a 305 T/A and same flow master muffler as i have and its a lot louder without the tips.

what about header inserts?

http://store.summitracing.com/partde...t=CCI%2D3DI04L

What the?! LOL I might just order those just to run open headers around town.

well i to be truthful Jeff, i dont think the flowmaster setup would have been restrictive at all for your old 383. not sure about the new engine though

i think it would support an engine deep into the 11's before starting to be to small....maybe we will see next season....
but i do love how it sounds on my car

Just add a bullit style muffler in your I-pipe. They will not restrict your power levels hardly at all. They are desinged for drag purposes where sound levels must be enforced. Many people do this to their SLP loudmouth set-ups to tone them down a bit. The only other way would be to change mufflers or add a cat.

pat that exhaust cost me 900 when it was new, you had better like it.

as far as the upgrade, yeah i question its necessity as well. along with everything else on the car when i can't even drive the thing anymore.

should have left it stock.

I agree with the bullet muffler idea. It would tone the note down a bit w/o costing you any power or sound quality.

later, justin...

any recomendations on a brand or exact type of bullet muffler.

if i can just add something in line much like a cat that would be great....don't want to make it quiet..just tone it down. there's a difference between sounding good and obnoxious. i'm way above that line right now.

I would look at dynomax and Borla's line of bullit mufflers. You can get one with a 4" in and out and it should really help tone down your exahust. They are loud when used without a muffler but since you will be running both it should really calm things down. They were desinged to keep sound levels down without sacrificing power fro drag race aplications.

Dynomax Bullets
Borla Sportsman Race Muffler

I know dynomax makes them, not even to much mulla out of jegs/summit. You can do just that, get a 4" in/out and put it somewhere inline just like a cat. When you look at it you wouldn't think it'd make a difference, but I think it would deffintely be the way to go. Like you said, same tone and sound, just not as obnoxious.

later, justin...

Kandied - I have the same problem with my exhaust. I thought about putting a Dynatech cone in the 4" near the rear axle.

Flowmaster makes a single chamber 4" muffler that has a very small body and should not effect ground clearance. I am thinking about trying this.

FWIW - I have 2 Y pipes for my exhaust. I have the Mufflex off road and a custom 3" Y that has high flow cats merging into the 4" much like the Mufflex. With the cats on, the sound level at part throttle is very good.

I have run 11.60's through the cats but have not run the car with the offroad Y pipe yet.

www.geocities.com/dzperf

I ran the dynomax bullit mufflers with my longtubes they dont do much muffling i was setting off car alarms with a almost stock 305but in your case they might be right.

how about a magnaflow bullit style muffler?

thanks for the suggestions everyone.....

i'm not sure about the magnaflow. i have their mufflers on my gtp and can't stand them but it could just be the application. however the shop that i deal with offers great rebates on magnaflow so maybe they'll let me try one out?

Run a 4 inch dynomax bullet muffler somwhere in the middle of the intermediate pipe, acting as a resonator.

That should quiet it down 2-3 db's.

I should sound very similiar to what you have now, just quieter.

Thats what we have been suggesting all along ^^

2-3 decibles on an exhaust that's pushing 120 db's isn't going to really justify the extra cost IMO. I've been there done that and it was a freak'n joke.

told u 4 inches would be over kill. never listen to the smart azn kid with common sense u jp. i would just cap it or shove some steelwool in it. that will silence it for about 2 weeks if u run it everyday. so for u prob about 100 or so miles.

FIrst I started with dual exhaust, flowtech "raptors" as mufflers. I was not satisfied with the tone, but i was somewhat satisfied with the noise level.

I figured it was time to change to dual 40 series flowmasters, i was very satisfied with the tone but they were so obnoxiouselly loud that i had to do something about it.

changed over to single 3" flowmaster 80 series (quiestest i could find) cat-back (no cat) I was satisfied with the noise level (very quiet) until my cam/intake swap. now its noisy as all crap again.


My next idea, to regain flow and not the noise, is dual exhaust, 2 mufflers per side. some free flowing dynomax mufflers (3" in/out) stacked together, 2 per side, should do the trick.

how is 40 series to loud. you sound like my dad. personally on the elco i have delta 40s 2.5 in dia or 2.25 i forget have to go measure. 80 series to loud. know i know your old if i were you i would go buy a bmw or maybe a honda. those are quiet. if you want to quiet down alot id go with 3 chamber exhaust and then weld in some silencers. if you want hi flow your gonna get loud exhaust. you get one or the other not both. im sorry to say you cannot have your cake and eat it to

yes you can...just have to know what your doing. plenty of high powered setups that are reasonable for street driving.

have you ever heard true dual 2 chamber 40 series flowmaster mufflers, 3" all the way around, behind a 406 small block idling at 1000 rpms, with a 4000rpm stall converter, a big cam and big heads?

everytime i left a stoplight everyone around me thought i was racing them. im telling you, even before i stepped on the gas it was shaking the fenders of the cars next to me.

I would never change my exhaust if it was like that! Especially since I have heard a similar setup. Nothing sounds better than exhaust like that.

How did you run it on a Third exactly? Did the tailpipes still come out in the stock location?

Very simply, longtubes to some home bent pipe to clear the Xmember, then just a simple straight pipe back a small bend and it exits before the tires. and ground clearance was same as the 3" catback, actually. this pic is during the tranny swap, after i built it and put in the converter.

king post some pics of the sides like how people would see it if you were cruising by. thanks

i'd have to see it from the side but i'd scrape on everything possible with that.

Im running 3 inch with just a high-flow cat and a bullet muffler and split to duals out the back...At idle it is noticible but not loud, But when you get on it it screams, But you can still keep it quiet....Plus for $35 you cant beat the price!

alright so collectively out of 40 some odd posts we can only come up with adding a bullet style muffler as an intermediate or some sort of resinator but that's the best idea beyond changing the muffler and actual size of the pipe dia. correct?

how are these concept vehicles putting out 800+ rwhp and you can't hear them coming then....?

Quiet Mufflers, along with resonators...

resonators yes......quiet mufflers.....yes and no. most of the setups are off the shelf although they do have custom pieces added for sound dampning. i'm going to try and contact them for some more info on it, i'll let everyone know what i find out.

i have that same setup except with the 3" flowmaster, the 6 1/4" case just fits into that little raised section under the rear seats, i like it alot and sounds mean as hell! i have 2 exhaust leaks and they infuriate me! when i get back home ill finish it up... in just at school right now...

*eric*

stuff some resin or fiberglass or steel wool in the muffler that will quiet it down alot

that is a SHOW car and has to go all out with everything... leave it loud man!! but id say build a little less powerful engine, id say thats your biggest noise maker

bullet mufflers make a bigger difference than you think. it will be more than 2-3 db. they will quiet the idle/cruise down a lot.

though bullet mufflers don't make much difference WOT.

http://store.summitracing.com/partde...rt=WLK%2D24217

would work well.