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they will give you much more power and torque all throughout the powerband compared to just plain old gutted precats. ask any of the so cal z'ers that have these pipes installed and they will all swear by them. most of us had gutted precats and upgraded to gregs pipes and felt a very noticeable difference. its a must do mod for those of you running over 15 pounds of boost.

Alfred Rhee (Southern California) 1995 Supra twinturbo (project car) 1991 MR2 turbo (daily driver) 1995 300ZX twinturbo (sold) 448 rwhp & 531 rwtq 1993 RX-7 twinturbo (sold)
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