There is going a difference in hp of about 5hp give or take advantage with test pipes but you also lose torque which is why I think good HFCs are the best balance of HP and torque gains. Motordyne Art pipes reportedly combine the best of both but with test pipe levels of flow but you still will deal with exhaust fumes and a bit of a wait time.
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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