BMW 3-Series (E90 E92) Forum - View Single Post

John320d · 02-04-2013, 02:54 AM

Do you mean having a back box only does not give you as much increase as having a back box and mid pipe.

02-04-2013, 02:54 AM	#4
John320d Lieutenant 30 Rep 559 Posts Drives: BMW 320d E93 Join Date: Dec 2009 Location: Manchester UK iTrader: (0)	Do you mean having a back box only does not give you as much increase as having a back box and mid pipe.
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