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okay, I love the new DPs but I'm kinda lost on this whole O2 sims thing. why would I need these and where would I get them? I'm currently running the CP-E cat back system and it's been great. this DP system would be an awesome addition to complete my exhaust.
you also mentioned getting the resonators. my CP-E system doesn't have them so how would I go about getting them on my Steptronic equipped car?
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former 135i owner - ditched it for a new Camaro SS
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