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Old 12-03-2019, 02:28 PM
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Default Sound level of exhaust dumping before axle vs. rear

Currently have my exhaust dumping out before the axles and really looking for something a little quieter. Does is make a difference in sound level if you extend the exhaust to the rear of car? I installed QTP mufflers (http://www.quicktimeperformance.com/screamer/) hoping I'd get a quiet muffler that I could open up for more sound, so I've got too much invested to swap out for another muffler at this point.

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Old 12-03-2019, 07:55 PM
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So you're currently running the Screamer mufflers with dumps and even in quiet mode it's too loud? Just making sure I understand you correctly.

In general, yes, running the exhaust out the back versus dumps will make things quieter inside with no other change.
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Old 12-04-2019, 11:36 AM
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So you're currently running the Screamer mufflers with dumps and even in quiet mode it's too loud? Just making sure I understand you correctly.
Correct, with the cut-outs fully closed its too loud for my taste. Hard to have a conversation with my kids in the back seat.

Thanks for the feedback, I'll try extending to the rear and see if it helps.
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Old 12-04-2019, 12:04 PM
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You could also add resonators to the pipes that you take all the way back to kill even more noise and drone.
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Old 12-05-2019, 10:05 PM
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x2 or high flow catalytic converters up front. Magnaflow and others make universal performance cats that won't take away power. They will help control the noise though. Good luck!
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Old 12-05-2019, 10:17 PM
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Are resonators more effective before or after the muffler?

I've seen it both ways, just wondering if there's a benefit of doing it one way or another.
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Old 12-09-2019, 02:02 PM
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Quote:
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Are resonators more effective before or after the muffler?

I've seen it both ways, just wondering if there's a benefit of doing it one way or another.
I think its more about packaging on some. The Trailblazer SS had it after the muffler. The butterfly valves to control drone on the GM trucks are after the muffler, but the Vette (if equipped with them, some aren't) are before the mufflers.
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Old 12-09-2019, 06:46 PM
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Tailpipes all the way to the back will definitely reduce the in cabin noise. I prefer the dumps because I don't care to talk to my kids.

But I get it.... do the tail pipes... then if still loud, do a larger case muffler setup.
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Old 12-09-2019, 10:12 PM
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Use a balance tube as well.
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Old 12-11-2019, 02:09 PM
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Quote:
Originally Posted by Flash68 View Post
Tailpipes all the way to the back will definitely reduce the in cabin noise. I prefer the dumps because I don't care to talk to my kids.

But I get it.... do the tail pipes... then if still loud, do a larger case muffler setup.
thanks, setting up a trip out to West Coast Muffler in Concord once we have a dry weekend.
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