You may gain a couple wheel horsepower and torque with test pipes over Berk HFCs but you need to decide if it is worthwhile. High flow cats will sound smooth and jive well with aftermarket cat-backs, I think they sound more refined which I personally like better. You don't get fuel/sulphur smell with HFCs either.
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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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