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The gains most are seeing with the downpipes are 30-40hp depending on cats/no-cats. It seems that according to those in the know boost is limited in lower gears and builds in the higher gears, probably why we are feeling it in 2nd and 3rd not so much in 1st. I would bet part of the problem is the DME is limiting boost and thus not seeing bigger dyno gains. I guess track times or quarter mile times might be a better measure.
Noushy
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