Comparison RD vs Stock Header
Senior Members
Joined: Jun 2008
Posts: 556
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From: oc, california
My Ride: stock non-sport alpine white '04 530i
those are beautiful, i would invest money into those, but california air emmisions are strict 
and i have to get a smog check in a year or two, and every two after that maybe i should do anyways?
and i have to get a smog check in a year or two, and every two after that maybe i should do anyways?
Former Vendor
Joined: Dec 2007
Posts: 3,624
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From: Anaheim, CA
My Ride: F10 M5
Model Year: 2013
Originally Posted by AlexFW' post='618157' date='Jul 7 2008, 10:45 AM
Already installed ?
How much difference can you feel ?
Do you have an estimation of the power gained without catalysts ?
How much difference can you feel ?
Do you have an estimation of the power gained without catalysts ?
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