well as far as HP goes test pipes vs hfc, test pipes would have gotten more HP but lost a little tq....HFC usually dont lose tq BUT yeild a little less HP than test pipes. Thats where i believe ART pipes come in. They have all the benefit of a test pipe and HFC. They actually yeild more HP than a straight pipe and more tq than a HFC...best of both. So i was thinking these matched with stock headers vs LTH on a otherwise stock set up, the difference cant be THAT much more...IDK...just brainstorming here
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09 GT-R
12' 370Z 7AT HANDED DOWN
12'+13' 5.0 SOLD
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