It is a proven combination, many have run that setup with great results. I used to run Berk HFCs with the stock exhaust and added a Tanabe Y pipe after. I ended up dyno'ing around the same amount of power that a cat-back exhaust would add so the gains are there. As for sound, it basically amplifies the sound of the stock exhaust if you like that type of sound but want more volume.
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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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