I have no dyno sheet, but the stock cats are the single largest restriction in the entire exhaust system so I don't understand how that is possible. I installed Berk HFCs in my car with a Tanabe Y pipe and the stock exhaust and put down 309rwhp which is the same or even a bit more power than what other Zs with CBEs put down on the same dyno.
After installing my FI CBE, I felt an additional bump in power and will be going on the same dyno to see what I gained soon.
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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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