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3-5 for PE, about 10 for both main and secandary cats removal.
PE wont cause any problem.
the cat will cause issue when u need smog exam done, also you need get a tune to get the setting right.
bonus part for N51, all emission related parts are covered by factory for i think 100k miles/10year N51 only special warranty.
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N51- PI - PE - ESS Tuned - SSK - CDV Delete - AFE Header - B12 - Mfactory LSD
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