Why does my 4v Mac Exhaust sound horrible after On3 turbo kit Install? - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 37 Old 06-22-2010, 11:18 AM Thread Starter
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Why does my 4v Mac Exhaust sound horrible after On3 turbo kit Install?

Recently i installed a on 3 kit on my stock 99 cobra .. Previously i had a Upr X and Mac Cat back and loved it it was a nice deep sound .. Now w/ the On3 pipes going into the Mac Cat back it sounds horrible like i have rock in the pipes/mufflers on decel and when i shift .. How does everyon else's exhaust sound ? Is there anyway to change it?

Should i add a resonator ..change my cat back?


1999 Rio Red/ Black Cobra . Manley Pistons, Scat rods Arp hardware.... On 3 Performance Kit w/Master power 70mm Turbo, 03/04 cobra tank and pumps , 60lb injectors ,HPX Mass air, 4:30 gears 03/04 axles & diff & SCT tuned by EFI logics
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post #2 of 37 Old 06-22-2010, 11:31 AM
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I have a Mac cat back and UPR off road x on my 97 gt, mine is pretty raspy and deff not a deep sound. I would maybe swap the mufflers for Magnaflows or something that normally has a deep sound. just my .02


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post #3 of 37 Old 06-22-2010, 11:32 AM
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You want a straight thru muffler with a turbo.

Ultra Flow, ect. ect.

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post #4 of 37 Old 06-22-2010, 12:12 PM
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Get Magnaflow Magnapack, I love it.

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post #5 of 37 Old 06-22-2010, 05:02 PM Thread Starter
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So the Mac being a chambered muffler is causing it?

1999 Rio Red/ Black Cobra . Manley Pistons, Scat rods Arp hardware.... On 3 Performance Kit w/Master power 70mm Turbo, 03/04 cobra tank and pumps , 60lb injectors ,HPX Mass air, 4:30 gears 03/04 axles & diff & SCT tuned by EFI logics
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post #6 of 37 Old 06-22-2010, 05:16 PM
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Yeah It's probably the chambered mufflers causing the issue. Something straight through would probably sound better and perform better too.

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post #7 of 37 Old 06-22-2010, 06:20 PM
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Check the piping that routes around the kmember on both sides for clearance. The kit I installed rattles at idle and makes more noise shifting, acel and decel.

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post #8 of 37 Old 06-22-2010, 07:01 PM Thread Starter
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Quote:
Originally Posted by T70Cobra View Post
Check the piping that routes around the kmember on both sides for clearance. The kit I installed rattles at idle and makes more noise shifting, acel and decel.
Yeah all the pipes are wrapped and nothing is hitting right now .. Maybe i will switch to a streight through muffler ..any suggestions? Im looking for a deep sound?

i do have some mufflers from a magnaflow exhaust laying around..

1999 Rio Red/ Black Cobra . Manley Pistons, Scat rods Arp hardware.... On 3 Performance Kit w/Master power 70mm Turbo, 03/04 cobra tank and pumps , 60lb injectors ,HPX Mass air, 4:30 gears 03/04 axles & diff & SCT tuned by EFI logics
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post #9 of 37 Old 06-10-2011, 10:41 AM Thread Starter
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Just figured i would update ! So i Switched to a SLP loud mouth 2 setup and the tone is alot deeper and meaner than with the Macs but at a 2000 rpm i still get a raspy sound .. I think it has to do with where the On3 pipe splits merges to meet the Slp exhaust . Some how its causing a weird exhaust note .. Later on i will cut it apart and take pics.

1999 Rio Red/ Black Cobra . Manley Pistons, Scat rods Arp hardware.... On 3 Performance Kit w/Master power 70mm Turbo, 03/04 cobra tank and pumps , 60lb injectors ,HPX Mass air, 4:30 gears 03/04 axles & diff & SCT tuned by EFI logics
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post #10 of 37 Old 06-10-2011, 11:09 AM
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I put SLP on my car, sounded like complete ####. Bought magnaflow and couldn't be happier

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post #11 of 37 Old 06-11-2011, 12:11 PM
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maybe it has more to do with the car having a turbo on it. My car is considerably more quite since I went turbo
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post #12 of 37 Old 06-11-2011, 02:37 PM
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have you though about borla?

they have a good sound. i have them on my 03 cobra and im fixing to go turbo also (i got the hellion 76mm precision turbo kit) so i hope to post up some results in a couple of months. im gonna do a motor build also.

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post #13 of 37 Old 06-11-2011, 04:20 PM
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which magnaflows is everyone suggesting ?? the reg magnaflows mufflers or the magnapacks .. just wondering as i have 2.5 mac dumps on my 4v and im pretty sure once i get the turbo on .. the exhaust is going to sound like a$$ with the macs...
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post #14 of 37 Old 06-11-2011, 10:14 PM
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post #15 of 37 Old 06-12-2011, 11:19 AM
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Does that kit have a wastegate that vents to atmosphere?


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post #16 of 37 Old 06-12-2011, 01:53 PM
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thought he was talking about 4v's huh?
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post #17 of 37 Old 06-14-2011, 11:23 AM
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Quote:
Originally Posted by nicecj7 View Post
Recently i installed a on 3 kit on my stock 99 cobra .. Previously i had a Upr X and Mac Cat back and loved it it was a nice deep sound .. Now w/ the On3 pipes going into the Mac Cat back it sounds horrible like i have rock in the pipes/mufflers on decel and when i shift .. How does everyon else's exhaust sound ? Is there anyway to change it?

Should i add a resonator ..change my cat back?

Nicecj7 – You’re probably not getting the full potential from your new turbo kit. We’re not sure about your specific setup, but when it comes to Flowmaster Chambered mufflers in turbo applications, we suggest installing the next size up inlet and outlet size muffler for best results with a chambered muffler or move to our dBX (Hushpower) muffler with the inlet and outlet size the same size as your exhaust tubing. Our dBX mufflers work great in street and strip environments and are also perfect for diesel and gas turbo applications.

Here’s a video from SEMA 2008 where they touch on some of the Hushpower design:


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post #18 of 37 Old 06-30-2011, 04:01 PM Thread Starter
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Thanks to all the replies , i havent been able to work on the car but im getting close and the Raspy noise on decel is getting old .. Great ideas to look at ..

1999 Rio Red/ Black Cobra . Manley Pistons, Scat rods Arp hardware.... On 3 Performance Kit w/Master power 70mm Turbo, 03/04 cobra tank and pumps , 60lb injectors ,HPX Mass air, 4:30 gears 03/04 axles & diff & SCT tuned by EFI logics
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post #19 of 37 Old 06-30-2011, 04:05 PM Thread Starter
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My current setup for exhaust runs from the turbo to the back of the car using a single 3" pipe which splits into two 2.5" pipes into the SLP loud mouth 2 exhaust i will will try and find a pic .

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post #20 of 37 Old 06-30-2011, 05:51 PM
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hey man my car sounds same way. i did have bola stingers on when it was first turbo'd. they sounded great with the blower. but not so much with the turbo. so i switched to magna flows. magna packs. they sound little better. but still sounds like ####. watch vid on decel. (sounds like a v6, its very tinny sound. i hate the way it sounds.


if you find any solutions please let me know.

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post #21 of 37 Old 06-30-2011, 06:04 PM
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Quote:
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here is a pushrod motor with a turbo and MAC catback.. it sounds like a regular all motor deal.

YouTube - ‪My buddy Mike's Turbo 383 Coupe II‬‏

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Is that Mike from Underground's old car?

On the cars I build, I have always ran straight through mufflers. I had f/m on my 2v for a little while and it was on the raspy side. I built a custom single 3" all the way to the back axle with a race bullet right under the driver side. Then at the stock muffler location I have a straight through magnaflow in the stock muffler location. It sounds really good I think

The 4v car I have here has straight through dynomax dual 2.5's and sounds good too I think
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post #22 of 37 Old 06-30-2011, 06:15 PM
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Originally Posted by On 3 Performance View Post

On the cars I build, I have always ran straight through mufflers. I had f/m on my 2v for a little while and it was on the raspy side. I built a custom single 3" all the way to the back axle with a race bullet right under the driver side. Then at the stock muffler location I have a straight through magnaflow in the stock muffler location. It sounds really good I think


any way you can get i picture of that??? so you run a race bullet then another muffler as well?? i take it you have a dummy tail pipe since exhaust only comes through one?

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post #23 of 37 Old 06-30-2011, 06:20 PM
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I cut off the stock tail pipes and welded a tab to each so it just looks like stock exhaust on the car. I ran the 3" all the way to the axle and then went up and over the axle and dumped it straight at the ground after it went over. I dont have any photos right now, I have a car on both lifts but as soon as one moves, Ill get the 2v in the air. Running that race bullet I added after the fact just to keep it more quiet and actually made it sound more deep
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post #24 of 37 Old 06-30-2011, 06:30 PM
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I cut off the stock tail pipes and welded a tab to each so it just looks like stock exhaust on the car. I ran the 3" all the way to the axle and then went up and over the axle and dumped it straight at the ground after it went over. I dont have any photos right now, I have a car on both lifts but as soon as one moves, Ill get the 2v in the air. Running that race bullet I added after the fact just to keep it more quiet and actually made it sound more deep
ok sounds good, thanks i may do that exact setup. because this sound needs to change.

have you guys ever tried using just 2 race bullets through the 2.5??? im assuming it would sound about what my magnapacks sound like.

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post #25 of 37 Old 06-30-2011, 06:40 PM
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Someone mentioned DynoMax. I have 2.5" Super Turbos on my N/A '95, and they have a very deep tone. (Not a good direct comparison, but thought you might like the info anyway.)

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post #26 of 37 Old 07-04-2011, 11:55 AM
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i've got a pypes violator catback on my 2valve. it has real deep idle, sounds great at wot but not overpowering. on decel there is a little rasp and poping, not much though. i'll have to have someone record me going by so i know what it sounds like to bystanders. in car its pretty quiet, with little drone. going from the pypes street pro chambered mufflers the violators have alot less drone.

i will try to get some audio clips.
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post #27 of 37 Old 07-08-2011, 03:30 PM
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I have the same issue with my 96 cobra with an on3 70mm turbo and mac exhuast. Sounds like a v6 and I cant stand it. I tried an open down pipe last week. Removed the mufflers and it was even worse. Decel is horrible. 3k sounds like a v6 until im spooled then it sounds good. I need some help. Im considering magnapacks in place of my Mac mufflers. Any thoughts?

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post #28 of 37 Old 07-15-2011, 02:04 AM
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It's the On3 piping thats causing it...when I had my On3 kit I had a MAC catback as well and it sounded horrible. I switched to a Magnaflow catback and it was better but still didn't sound right. So I sold the On3 kit and went with a single 70mm TCI kit and it sounded like a Mustang again. No more raspy tingy crappy sounds...

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post #29 of 37 Old 07-15-2011, 07:02 AM
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Quote:
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It's the On3 piping thats causing it...when I had my On3 kit I had a MAC catback as well and it sounded horrible. I switched to a Magnaflow catback and it was better but still didn't sound right. So I sold the On3 kit and went with a single 70mm TCI kit and it sounded like a Mustang again. No more raspy tingy crappy sounds...
This is why I asked early on if the On3 wastegate vents to atmosphere.

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post #30 of 37 Old 07-15-2011, 08:19 AM
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turbo mustang=sounds like poop regardless of what you do IMO
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post #31 of 37 Old 07-15-2011, 12:12 PM
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This is why I asked early on if the On3 wastegate vents to atmosphere.
The kit he installed is the 1st gen which does recirculate if Im not mistaken. Our 2nd gen forward facing design goes to atmosphere though. Just curious though with regular driving, that should make no difference.
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post #32 of 37 Old 07-16-2011, 04:26 PM
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Here is video of mine with my TCI turbo kit that didn't have that raspy tangy exhaust note. In fact it was too quiet with the Magnaflows if you ask me...


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post #33 of 37 Old 07-17-2011, 03:11 AM
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Originally Posted by blue93hatch View Post
turbo mustang=sounds like poop regardless of what you do IMO
completely agree!

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i've got a pypes violator catback on my 2valve. it has real deep idle, sounds great at wot but not overpowering. on decel there is a little rasp and poping, not much though.
Now this is still a kind of chamber muffler with a staight though design, kind of a crossover of a straight thought and a flowmaster. Has what they call a mini sound deflector inside but is said to flow the same amount of air as a straight design.

I use Pypes Race Pros they are a straight though muff, and the cheapest Ive seen (50$ each maybe). quieter at idle and cruise than the flowmasters I took off, but better for performance. I have at times debated of they are to quiet, but I do prefer to hearing the turbo spooling up. Thats coming from a die hard fan of the flowmaster sound on a 5.0L

Link ---> Pypes Performance Exhaust - Mufflers

88lx Conv. 200K mile stock longblock. Trickflow intake, 42lb inj, Pmas protube,TKO500, 3:27, pypes muffs, Pa Racing tubluar K-member, DIY single turbo setup. Summit aluminum rad, Crane Hi-fire ign, subfames, 17" sc saleen's, Saleen ground effects, SCT tune by Dynosport. 380HP 435ftbs.

Last edited by 71swing; 07-17-2011 at 03:19 AM.
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post #34 of 37 Old 07-20-2011, 03:11 PM
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completely agree!


Now this is still a kind of chamber muffler with a staight though design, kind of a crossover of a straight thought and a flowmaster. Has what they call a mini sound deflector inside but is said to flow the same amount of air as a straight design.

I use Pypes Race Pros they are a straight though muff, and the cheapest Ive seen (50$ each maybe). quieter at idle and cruise than the flowmasters I took off, but better for performance. I have at times debated of they are to quiet, but I do prefer to hearing the turbo spooling up. Thats coming from a die hard fan of the flowmaster sound on a 5.0L

71Swing – It’s a bummer that we couldn’t win over a diehard Flowmaster fan this time around. Maybe next time you’ll go back to Flowmaster with the upsized pipe diameter trick for turbo applications or go for a Flowmaster Pro-Series, which is a great turbocharger muffler.

‪Hushpower Pro Series Sound Test‬‏ - YouTube

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post #35 of 37 Old 07-20-2011, 05:04 PM
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71Swing – It’s a bummer that we couldn’t win over a diehard Flowmaster fan this time around. Maybe next time you’ll go back to Flowmaster with the upsized pipe diameter trick for turbo applications or go for a Flowmaster Pro-Series, which is a great turbocharger muffler.

‪Hushpower Pro Series Sound Test‬‏ - YouTube


Sounds good. If i do not like my borla stingers I'll try those flowmasters.

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