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      10-01-2013, 07:09 AM   #11
gbizzle
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Drives: 2011 E90 ZCP ///M3
Join Date: Oct 2012
Location: NE

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2011.75 BMW M3  [3.63]
They helped complete the package and throw out about 20hp. I doubt they would pass a smog inspection. The SES light would come on every so often, so a tune with an auto-clear function is a must. I was lucky that my state did not require it.
Quote:
Originally Posted by s!ke View Post
How much did the downpipes help with power? Will it still pass smog with those cats?
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BMW 2011.75 E90 ZCP M3 Jet Black | Dinan Intake/Tune/Exhaust/Underdrive/Strut Bars | Lux V4 | OSRAM 5500K CBI | 25% Tint | garage queen Sunday driver.

*M3 E90 OEM chrome grills, OEM pulley w/ belts for sale! If interested, please send me a PM.*