BMW M3 Forum (E90 E92) - View Single Post - DIY: OEM x-pipe secondary cat removal/gut

BT M3 · 12-08-2010, 09:16 AM

This is incorrect information from my dyno findings. A proper custom tune will yield 15-20whp. And the secondary cats are maybe worth 10hp and some noise. The primaries delete are worth alot more as the design is far more restrictive.

12-08-2010, 09:16 AM	#4
BT M3 Second Lieutenant 12 Rep 214 Posts Drives: 2010 M3 Join Date: May 2010 Location: MA iTrader: (0)	This is incorrect information from my dyno findings. A proper custom tune will yield 15-20whp. And the secondary cats are maybe worth 10hp and some noise. The primaries delete are worth alot more as the design is far more restrictive.
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