What is the diameter of stock downpipe outlet (to cat-back exhaust) piping?
02-27-2006, 03:43 PM
#2
AudiWorld Super User
2.157" from ASP's website
<i>There seems to be many misconceptions about the stock exhaust tubing size. The exact tubing size of the S4 cat back exhaust is 2.157" in english units, this is also the I.D. size of the stock couplings.</i><ul><li><a href="http://www.autospeedperformance.com/Exhaust/Downpipes.htm">http://www.autospeedperformance.com/Exhaust/Downpipes.htm</a></li></ul>
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