how can a muffler delete possibly cause a rich condition? it must be something else that has caused this. allowing air to more easily flow out of your cylinders cannot cause a rich condition.
someone else chime in if im missing something here
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09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways
326whp/268tq
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