Stock exhaust piping diameter?

JayReplay · 02-12-2010, 10:01 AM

Hey guys Im looking to build a custom exhaust and was wondering what is the diameter of the stock piping. For those who have done a muffler delete, did your shop use 2.25" or 2.5"?

TommyK · 02-12-2010, 01:29 PM

its 2.25 going to the res and then 2.5 past the axle back.

correct me if im wrong

i used 2.5 for my delete and forgot what size for the res. i think it was 2.25 for the Y pipe

02-12-2010, 10:01 AM	#1
JayReplay Lieutenant Colonel 85 Rep 1,523 Posts Drives: E46 M3 6MT Sunroof Delete Join Date: Mar 2008 Location: River Forest, IL iTrader: (18)	Stock exhaust piping diameter? Hey guys Im looking to build a custom exhaust and was wondering what is the diameter of the stock piping. For those who have done a muffler delete, did your shop use 2.25" or 2.5"? __________________ 2002 Laguna Seca Blue E46 M3 6MT 2017 White C63 AMG Coupe 2002 Oxford Green E46 M3 6MT - Sold
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02-12-2010, 01:29 PM	#2
TommyK Brigadier General 119 Rep 3,325 Posts Drives: E90 335i LCI Join Date: Aug 2008 Location: Orange County, CA iTrader: (9) Garage List 2009 BMW 335i LCI [0.00] 2006 E90 330i [0.00]	its 2.25 going to the res and then 2.5 past the axle back. correct me if im wrong i used 2.5 for my delete and forgot what size for the res. i think it was 2.25 for the Y pipe
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