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What kind of hp / tq gains are you folks seeing with an exhaust system consitsting of catless downpipe and straight exhaust pipe from the turbo to aftermarket straight-through mufflers with a retuning? The car in mind is a 2009-2010 Subaru Forester 2.5 XT and the exhaust in question would be 3inch downpipe, midpipe, to dual 2.5inch to the mufflers. The exhaust system and tuning would be the only factors changed.
 
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