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2.5" is probably the biggest you can go on an n/a to get good results. 3" is way too free-flowing, and yes youll lose low end torque. check out the "Exhaust systems researched" thread in the FAQ.
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i agree with him
n/a with a 3" exhaust and youll lose sum bottom end power
ie sum torque
n/a uses the backpressure of the exhaust system to gather up sum torque
have the exhaust too free flowing and loss of hp will occur
idk about top end power
well there's not really that much with the n/a
cuz its starts to slow down at 4th gear