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dual exhaust
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  1. 9-3 Sedan, Cabrio '04+, Combi, 9-3X Workshop
    hi all, i am considering to upgrade the stock exhaust off the MY08 93 aero to a dual exhaust. i am currently on hirsch stage 1. any leads to that? also, what are the critical points to consider in making the choice without compromising bhp or Nm? cheerios....;)
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