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To get the best results When changing pipes is to put on fuel pack AND open air filter!!
So YES!
I say again : For the best results in torque and power combine all 3 of them!!
Put on just the pipes and all you get is noise.
DO NOT FORGET a DYNOJET RUN...
Almost nobody does it BUT it's the most important.Don't do this and you'll have holes in the horsepower throughout it's range.
By a Dynorun you determine EXACTLY ,with a laptop, the fuel management in order to have a smooth line of torque and horsepower.
