Exhaust option S4 2.2

[vcosmin]

My orginal exhaust need replacement, and i also want to prepare it for future upgrades. What is the best route to go, i need to keep clearance as good as possible, and for exhaust to flow around 500hp. 2x2.5" or stock exhaust like here ? http://homepage.internet.lu/customau...US.htm#EXHAUST
Or go to 3" all the way ?
Need to be quiet, as this is my DD.

[vcosmin]

Ok, let's put it this way, how much hp, on stock exhaust system, no cats, and larger downpipe?

[Rusty]

Fit a 3" DP with sports cat - that's fine for your requirements. As to what you put after the cat, for 500bhp, you'll want 3", for more modest power, you'll be fine with 2.75".

[vcosmin]

It's for an 100S4, it has 2x2.1/4" from factory all the way , does this not flow like 1x3" ? I have no need for cats, downpipe will be 3"

[Costash]

if you gonna replace only the down pipe with 3'' is what you need really up to 380.I would like to have a quieter exhaust again ...

[Rusty]

The same area doesn't equal the same flow, due to different surface area of the pipe per unit length. 2x 2.5" would be a good option but not really necessary when 1x3" works.

[vcosmin]

And 1x3" can keep the same ground clearance, like 2x2.5" ?

[Costash]

The clearance on single 3'' system is better than stock least on the front side.I used to touch the humps before with stock downpipe but now no problems.