contributed by: jakecro [ww] | jakecro@gmail.com

In the past I've came across many people asking various stock exhaust measurements in order to make modifications. Below is a list of what I have so far.

Stock S4 exhaust measurements:

outside diameter of piping @ center resonator:
inlet: 2.54OD
outlet: 2.58OD

exhaust clamps that mount rear section to down pipes:
the circumference of the pipe @ the clamp is ~175mm
diameter of 55.7mm