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      03-13-2013, 11:59 PM   #1
M3takesNYC
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Drives: m3
Join Date: Feb 2013
Location: NYC

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AA xpipe smaller pipes than OEM

I have an active xpipe/HFC with 2 resonators and my oem xpipe off the car and was comparing them. The AA has smaller diameter piping throughout the entire way. I didn't have a tape measure but used a string and marker. Need to find a ruler or measure but it appears the AA is 2.25inch piping and the OEM maybe 2.5 inch piping.

I am wondering if this is engineered to increase velocity or was it simply a matter of that small of a difference does not matter and 2.5 inch is much easier to get than the wier d2.75 inch bmw likes to use in other applications?

Last edited by M3takesNYC; 03-14-2013 at 12:10 AM.