Lifesgood

I noticed this sound for a while, when i gas the car i hear a knocking/rattling sound from the back, usually when i gas it to high RPM, it sounds like my exhaust is maybe touching a part of the car, but i checked and its firmly on and no movement. Anyone know what else it could be? It is getting a lot more annoying now that i keep noticing it.

@wesome

maybe your cat innards are blown up inside your exhaust

@wesome

installed with your exhaust.. then put the TP in?

or did you do it all together?

Lifesgood

I had the TP and then replaced it with my cat for SMOG, but even when i had the TP it still made the sound. I have a stock exhaust setup for now.

@wesome

just aft of the downpipe... there is a bend there and sometimes that rattles.

You need to check the exhaust by crawling underneath and moving it at a bunch of different locations, not just the tip.

Hillbilly

I remember hearing someone say that their exhaust would "move" nearly 2" when it was at temperature. I'm not sure if I believe that it expands that much, but I guess it's possible.

.Acide// gt2871r'd

a similar problem on my other A4)

<a href="https://forums.audiworld.com/a4/threads/897200.phtml#2847221"> Click here</a>

myers1.8TQ

You could be half right, since its coming from the back it could be the muffler innards . .

Joey T

The round stopper inside the housing ****slodes. A rattle noise on decel from the turbo area means a bad turbo. ( the wastegate stopper if fuxored, and cannot be replaced )

.Acide// gt2871r'd

I know mine does that rattling on rev up and down.

Guess I'll know for sure once it goes Big turbo