Anyone with Mufflex 4in Exhaust?Thoughts?
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Anyone with Mufflex 4in Exhaust?Thoughts?
Kinda curious how people like the 4in exaust? Hows the ground clearance and the sound??Any pics? Have 3in flowmaster cross flow now. Want something diffrent. Please post!
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
I love mine....the ground clearance is awesome and the sound is good. I have the 4inch with the spin tech muffler ( single out)
Just click the link in my sig if you want to hear it.
Just click the link in my sig if you want to hear it.
#3
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Man..pretty aggressive sounding..I LIKE
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
my buddy's old Ls1 car had a 4inch mufflex. it sounded great but i just dont like how it only has 1 exit. i like dual exits.
for the most part the fit and finish looked great. You only really need a single 4 inch exhaust for big hp numbers tho. i'd stick with a good 3-3.5 inch catback if your not planning on anything big. I will be running a 3inch single for now when my 383 goes in. i'm looking for near 500hp too on motor, so i know a dual 2.5 or single 3.5-4 is in order
for the most part the fit and finish looked great. You only really need a single 4 inch exhaust for big hp numbers tho. i'd stick with a good 3-3.5 inch catback if your not planning on anything big. I will be running a 3inch single for now when my 383 goes in. i'm looking for near 500hp too on motor, so i know a dual 2.5 or single 3.5-4 is in order
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
my buddy's old Ls1 car had a 4inch mufflex. it sounded great but i just dont like how it only has 1 exit. i like dual exits.
for the most part the fit and finish looked great. You only really need a single 4 inch exhaust for big hp numbers tho. i'd stick with a good 3-3.5 inch catback if your not planning on anything big. I will be running a 3inch single for now when my 383 goes in. i'm looking for near 500hp too on motor, so i know a dual 2.5 or single 3.5-4 is in order
for the most part the fit and finish looked great. You only really need a single 4 inch exhaust for big hp numbers tho. i'd stick with a good 3-3.5 inch catback if your not planning on anything big. I will be running a 3inch single for now when my 383 goes in. i'm looking for near 500hp too on motor, so i know a dual 2.5 or single 3.5-4 is in order
I emailed mufflex and they recommended a 4" for anything over 375 flywheel hp.
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
I really recommend 4'' for any motor making 375+ crankshaft HP. 3rd and 4th
gen systems have some different mounting points for hangers so they will not
work without fabrication involved
Thanks Denny,
www.Mufflex-Performance.com
609-890-0481
----- Original Message -----
From: ">
To: "Mufflex" <mufflex@comcast.net>
Sent: Tuesday, December 25, 2007 12:41 AM
Subject: Support form - Mufflex
#9
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
With in my experience you can make power with a 3 inch and short tube headers for that matter too but with my 357 vortec head engine and a factory LT-4 cam I dropped a half second and gained 5+ MPH by switching from TES headers and a 3 inch exhaust to hooker long tubes and a 4 inch just my experinece
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
I picked up quite a bit from getting rid of my old single 3 inch and moving to a dual 3 inch. Buuuuut for the past year I've been wanting to quiet the car back down and run a single 4 inch with the Spintech.
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
yeah I find my 4 inch with a flowmaster to be a good compromise between all out performance and obnoxiously loud my friends 5.0 with 3 inch pro dumps is just too much IMHO
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
FWIW, I was just at the dyno last weekend with my friend. He pulled off his 4" spintech, and put on a 4" Ultraflo. Picked up 24 rwhp just with the muffler change. Tuning in more fuel (less back pressure, more airflow) ended the day with an additional 62rwhp..
Take a look inside a spintech, before you decide to install one...
Take a look inside a spintech, before you decide to install one...
#13
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Yea.. I've seen with my own eyes how bad spintech flows...With a head flowing machine.. Flowmaster flowed better..Glass packs the best. But hate how they sound.Ew. But love how spin tech sounds!
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
FWIW, I was just at the dyno last weekend with my friend. He pulled off his 4" spintech, and put on a 4" Ultraflo. Picked up 24 rwhp just with the muffler change. Tuning in more fuel (less back pressure, more airflow) ended the day with an additional 62rwhp..
Take a look inside a spintech, before you decide to install one...
Take a look inside a spintech, before you decide to install one...
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
I've run spintech in the past, really liked the sound. Don't recall hearing the ultraflo but may look into it.
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Totally missed Mikes post!!!
I have had a Mufflex 4" system for a few years now. Just replaced my SpinTech muffler with a Dynomax Ultraflo. A year ago.. I went to a Dyno Day and put down 450/455 rearwheel. 13.2 AFR's
This past week I went back to the same dyno and right off the bat put down 474rw with a 14.x AFR. Added fuel to make the AFR's where they need to be.. and put down 511/501 rw, that tells me the SpinTech was holding me back....
YMMV..
Rick
I have had a Mufflex 4" system for a few years now. Just replaced my SpinTech muffler with a Dynomax Ultraflo. A year ago.. I went to a Dyno Day and put down 450/455 rearwheel. 13.2 AFR's
This past week I went back to the same dyno and right off the bat put down 474rw with a 14.x AFR. Added fuel to make the AFR's where they need to be.. and put down 511/501 rw, that tells me the SpinTech was holding me back....
YMMV..
Rick
Last edited by Skweezn87; 01-25-2008 at 07:05 AM. Reason: Missed Mikes Post about the dyno session
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Totally missed Mikes post!!!
I have had a Mufflex 4" system for a few years now. Just replaced my SpinTech muffler with a Dynomax Ultraflo. A year ago.. I went to a Dyno Day and put down 450/455 rearwheel. 13.2 AFR's
This past week I went back to the same dyno and right off the bat put down 474rw with a 14.x AFR. Added fuel to make the AFR's where they need to be.. and put down 511/501 rw, that tells me the SpinTech was holding me back....
I have had a Mufflex 4" system for a few years now. Just replaced my SpinTech muffler with a Dynomax Ultraflo. A year ago.. I went to a Dyno Day and put down 450/455 rearwheel. 13.2 AFR's
This past week I went back to the same dyno and right off the bat put down 474rw with a 14.x AFR. Added fuel to make the AFR's where they need to be.. and put down 511/501 rw, that tells me the SpinTech was holding me back....
#18
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Thats awesome to know. And to think I was gonna get spin tech. More than likely get a flowmaster kit. But the ultraflow sounds pretty sweet!
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Yea..I dunno. I don't really want to mess with cut outs. One more thing to mess with. Has any one here used ultraflow? Never heard of it till now.Any sound clips??
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Dynomax UltraFlo part #: WLK-17538
http://store.summitracing.com/partde...5&autoview=sku
Mike seemed to think the idle was "louder" just at a deeper tone. Cruise is just really quiet compared to the SpinTech. The SpinTech had this tin can sound to it.. and loud at cruise/part throttle.
I had an UltraFlo back in the day and loved it, 3" in with dual outlets on Dr. side. (just like the SLP system)
I dont have any sound clips.. I will try to get some this week..
Rick
http://store.summitracing.com/partde...5&autoview=sku
Mike seemed to think the idle was "louder" just at a deeper tone. Cruise is just really quiet compared to the SpinTech. The SpinTech had this tin can sound to it.. and loud at cruise/part throttle.
I had an UltraFlo back in the day and loved it, 3" in with dual outlets on Dr. side. (just like the SLP system)
I dont have any sound clips.. I will try to get some this week..
Rick
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
FWIW, when you do the math and calculate the "cross-sectional area," the single 4" is about 12.6 sq in. and dual 3" is about 14.1. Not as big a difference as I thought it would be.
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Wow, that much power over a muff change? I bought a 4 in mufflex used and it has a flowmaster on it. I might to look into the ultra flow. That's some jack for a muffler, $200? Damn. It costs money to go fast.
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Yep.. its called bottle necking. If the air can come in.. and cant get out fast enough. Hp is limited. Free up the bottle neck and wonderful things happen..
Well as they always say.. " Wanna play .. gotta pay!" HP dont come cheap.. especially "reliable" hp...
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
That sounds great. I think I am also going to go with the Mufflex four inch exhaust. I want to run the Dynomax bullet muffler instead of the Spintech. Did you have to elimate any suspension parts where the pipes go up and over the rear axle? If so did it affect the handling. I have a set of weld in subframe connectors installed on the car but I would still like to keep the vehicle safe on a road course.
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
I just swapped my Spintech for that Ultra-Flo PN# WLK-17538 muffler on my 4" Mufflex last weekend. Man let me tell you it's like night and day. I had to add more fuel at WOT. I used to have consistant 113-114 mph trap speed in the 1/4. I went to the track last weekend and ran a 11.64 @ 120 mph with a 1.68 60ft on the first pass, I added more fuel at WOT and backed it up with a 11.66 @ 122 mph with a 1.80 60ft. So all you guys thinking about getting a 4" mufflex don't buy it with a spintech or flowmaster. I have proof in my hand what a Dynomax Ultra-Flo can do. And it sounds pretty good too.
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
thats REALLY hard to believe that the spintech held you back roughly 60-70hp. that is Huge just for a muffler to do that.
7mph in the 1/4 is HUGE. there must have been a big difference in weather that gave you some more power as well.
7mph in the 1/4 is HUGE. there must have been a big difference in weather that gave you some more power as well.
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
I know what your saying, I was baffled myself. I just scanned my time slip of both runs. On the second pass I had to let off at the top of second because I was breaking loose. Well I can't get the link to work so I guess you'll have to go to the Dragracing forum for the time slip. I can't attach the same pic on this thread.
Last edited by zz17iroc; 02-15-2008 at 04:53 PM.
#34
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Thanks man for the props. I'm going back to the track tomorrow and see what happens on the bottle. I'll post results.
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Do you think a 4 inch Magnaflow muff would yield the same results?
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
That sounds great. I think I am also going to go with the Mufflex four inch exhaust. I want to run the Dynomax bullet muffler instead of the Spintech. Did you have to elimate any suspension parts where the pipes go up and over the rear axle? If so did it affect the handling. I have a set of weld in subframe connectors installed on the car but I would still like to keep the vehicle safe on a road course.
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Where can I pick up 4in pipes with that amazing sound "1FastZ"?
I loved that sound. What would I have to do to it to make the pipes fit?
I loved that sound. What would I have to do to it to make the pipes fit?
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Would it be stupid to put on a muffler or does that defeat the purpose
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
oohh ya trust me i kno that one. had to cut off my old muffler cuz it was too rusted. drove w/ no muffler for a week while i waited for the new muffler to arrive
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
You don't even see the exhaust tip on my car.
----------
Other than Mufflex, I don't know where you could get them. Maybe a diesel place would sell the 4 inch pipes
----------
Other than Mufflex, I don't know where you could get them. Maybe a diesel place would sell the 4 inch pipes
Last edited by 1FastZ; 02-18-2008 at 06:23 AM. Reason: Automerged Doublepost
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Hey "1FastZ" Could you possibly put up a few pics of your exhaust setup underneath. That would be cool. Thanks.
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
Is that a muffler it is hooked up to? If so what kind is it? Where could I pick this setup at? A truck shop or what. Mufflex really didnt have anything I could find.
Thanks "1FastZ" for bearing with me hear. I just love the sound and is EXCATLY what I'm looking for the sound.
Thanks again
Thanks "1FastZ" for bearing with me hear. I just love the sound and is EXCATLY what I'm looking for the sound.
Thanks again
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
With in my experience you can make power with a 3 inch and short tube headers for that matter too but with my 357 vortec head engine and a factory LT-4 cam I dropped a half second and gained 5+ MPH by switching from TES headers and a 3 inch exhaust to hooker long tubes and a 4 inch just my experinece
#50
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Re: Anyone with Mufflex 4in Exaust?Thoughts?
You got to look under there web site a little. Forgot what its under. Had that problem too.