Should I go 2.75" og 2.5" over the rear diff?

[Jonas_R]

Planning on doing some modification to my turbo back 3" exhaust system.

Currently the exhaust is very close to the rear diff and I have pressed the pipe a bit to get it to fit.

However I'm considering making a reduction over the rear diff, the idea was to make it either 2.75" or 2.5" and perhaps use reductions that non concentric to move the pipe at bit further away.

But what gives the smallest amount of powerloss or is negligible when the rest of the system is 3"?

[Jamo]

2.75 and you won't notice any difference

[Jonas_R]

Cool thanks

[Rusty]

I've had this done on mine at the request of the exhaust manufacturer. It works well and is quieter too.

[Mcstiff]

Go oval!



I plan too.

[Audi_CQ]

3" wasn't OK past the diff on my CQ. Tight, but doesn't hit anything so 2.75 shouldn't be a problem