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Custom Catless Manifold + BMS Downpip Fix Install
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11-20-2012, 10:01 PM
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mapleridge
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Drives: E90 N52 AT
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You should dyno before doing all the exhaust mods. My last exhaust with cat delete showed about 2hpgains. Wasn't worth the money. Stock system is quite good. I think removing the restrictions in the cats is all that is needed for power and tq.
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