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Cat back/muffler

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Old Jun 16, 2019 | 11:39 PM
  #1  
MC_87's Avatar
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From: Ontario
Car: 1987 Iroc
Cat back/muffler

The fuel pump had to be replaced and I had to get into the exhaust. Only replaced the muffler and tailpipes. Tailpipes matched the originals almost dead on which was nice and the muffler was a dynomax same size as original. For some reason the dynomax is more quiet than the original system. What do you guys recommend to get a nice low rumble not really loud and something that doesnt pop when letting off the throttle. I noticed a pinhole starting at the lowest point of the intermediate pipe..car has been kept inside since new pretty much and never seen rain but its the original 32 year old pipe. The cat is gutted already which is weird how the stock muffler with the cat was a bit louder than a dynomax without. Id like some sound clips of different mufflers or cat back systems.
Id like some thoughts.
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Old Jun 17, 2019 | 07:14 AM
  #2  
DaveyDug's Avatar
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From: Ohio
Car: 1989 IROC
Engine: 5.7 TPI
Axle/Gears: 2.77 Posi
Re: Cat back/muffler

There are tons of old Thirdgen threads on this subject, if you perform a search. There are also tons of YouTube videos available.

Personally, I think Borla sounds the best, but they're big bucks.
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Old Jun 18, 2019 | 07:22 AM
  #3  
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Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: Cat back/muffler

It's common for mufflers to get louder with age because the material that does the sound dampening gets more dense.

I think popping and crackling on decel is the engine tune, not the exhaust.
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Old Jun 18, 2019 | 08:00 AM
  #4  
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Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: Cat back/muffler

Ive had a Borla on a third gen and it had a deep tone not like the raspy exhaust note of my current flowmaster. I do like the flowmaster but Borla is much better. Price is much more though also.
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Old Jun 24, 2019 | 11:21 AM
  #5  
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Re: Cat back/muffler

I've always been a huge fan of the Hooker Aerochamber. sounds the most natural in my opinion.
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