4.3 Backflow and sound
Starting Member
Joined: May 2024
Posts: 130
From: Waterloo, Iowa
I've had a dynomax 2.5" cat-back setup on my Sonoma for about 6 or 7 years now, and quite like it. It has a nice full sound at idle and driving around town, but no drone on the highway. Definitely don't expect a cammed V8 rumble, but it's a more full & deeper sound than the factory exhaust. Mine is only mildly louder than the factory exhaust.
As for any performance changes, the headers, cats, and the Y-pipe are the major restriction points in the exhaust, so unless you replace everything I wouldn't expect any major changes in any performance metric. Because those are all upstream from the muffler, the muffler and larger down-stream cat-back tubes won't change anything with the back-pressure.
As for MPG, I did not notice any change to my fuel economy with that mod.
As for any performance changes, the headers, cats, and the Y-pipe are the major restriction points in the exhaust, so unless you replace everything I wouldn't expect any major changes in any performance metric. Because those are all upstream from the muffler, the muffler and larger down-stream cat-back tubes won't change anything with the back-pressure.
As for MPG, I did not notice any change to my fuel economy with that mod.
BF Veteran
Joined: Jan 2008
Posts: 2,748
From: Southern, Alberta
You can do anything if you are decent with a welder. Lots of places where you could find size adapters to adapt the muffler output to the factory 1.75" pipes. The smaller pipe would likely result in a fairly quiet exhaust. Personally, I have a custom 2.75" pipe downstream from the muffler to the fender behind the rear passenger tire, similar to the routing of the factory exhaust.
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Blazerx85
2nd Generation S-series (1995-2005) Tech
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Feb 8, 2007 12:32 AM