Agreed, but most of the gains are in the exhaust dept, the intake is pretty open as is with a direct cold air feed too. I've seen Stillen intakes make 6 hp up top and lose midrange so I do not see 12whp for just tubes at all.
5whp is believable though.
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2013 Ford Mustang GT
374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
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