Thread: Three-Stage Intake Manifold N52B25 - 323i
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      11-17-2011, 01:26 AM   #63
onephattai
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Drives: e90
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Quote:
Originally Posted by DimSum View Post
no you cannot pass emissions with primary cat delete. Secondary yes.
A proper intake will also help your car.
what is the benefit of secondary cat delete?
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