Thread: Custom Catless Manifold + BMS Downpip Fix Install
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      11-22-2012, 10:58 PM   #28
1slowbmw
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Drives: BMW e90
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Originally Posted by kiwi29 View Post
Hmm.. I get what you mean now, is this meant to use only with catless headers/dp?
yea it tricks the car into thinking the cats are still there to prevent a CEL and failing emissions tests
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