What's this stub on the exhaust system?

Old 02-23-2013, 05:33 PM
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What's this stub on the exhaust system?

I've been shopping for an S2k, and today I looked at the underside of a 2004. It had a short length of exhaust pipe sticking out towards the drivers side. It was welded to the pipe between the cat and resonator, the end of it was closed shut. Looked like a factory part. What's it for, what's it do?
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Old 02-23-2013, 06:08 PM
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it's normal. small baffle/expansion chamber imbedded in the pipe, methinks.
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Old 02-23-2013, 06:13 PM
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I think it is to remove drone. I had a Invidia exhaust and I actually copied the pipe to see if it would help. It did but not enough for me to keep the Invidia, but it did help..
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Old 02-23-2013, 07:32 PM
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Thanks. I was just wondering, even the owner, who's a mechanic, didn't know what it was for.
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Old 02-23-2013, 07:41 PM
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Sound resonator.
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Old 02-25-2013, 06:15 AM
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Originally Posted by gomarlins3 View Post
Sound resonator.
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Old 02-27-2013, 01:38 PM
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The little offshoot takes the exhaust pipe out of resonance. Doing away with the resonance allows better flow and adds power. A friend of mine working on a factory racecar did basically the same for the intake and found 9 HP on the dyno. This was done with alot of simulations and knowhow, but all the same he modified the intake on the dyno with PVC pipe from Home Depot.

Last edited by CLUBRCR; 02-27-2013 at 01:41 PM.
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Old 04-13-2013, 10:06 AM
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The technical term is hemholz resonator. The slang for it is donkey d*ck. Its purpose is to break the resonance peaks we know as drone. Its exact location is very critical and may not be the same on other muffler systems.
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