I saw the bottem of my car for the first time today. My question is what is that little pipe that shoots off just after the cat? It's about 8" long, and sealed with a cap. Even the tech didn't know what it was.

Thanks

 

Im pretty sure its meant to tune the sound of the exhaust.

 

I've heard it reduces resonance and vibration.

 

It's a resonator similar to the resonators on intakes.

It's tuned so that the inherent pulses from the headers work in favour of exhaust flow rather than against it.

[Edited by AusS2000 on 03-22-2001 at 09:33 PM]

 

if you were to cut the pipe off, what would happen to the sound? wouldn't it increase b/c it's a resonator?

 

Thanks for the answers guys!
It just looks so out of place, sticking off the side like a pimple