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Originally Posted by LeMansX5
??exhaust?? Not sure what you mean?
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Software tune that bumps up the boost like what Hamann did to acheive 360hp out of the X6 that comes standard with 300hp. I know Dinan is working on a tune for X6 50i that should increase the stock power from 400hp/450lbs torque to +/- 475hp/550lbs.