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I don't know if it would work for you but LS6 intakes work very well on Cath. Port heads and are stock on 02 Z28/TA,s and a 90 mm. Thr. Body did nothing for me on the Dyno over the 78 on my LS6 with cam,headers,tune. This was 8 years ago but other than a Fast intake nothing I tried worked as well. I know the truck intakes work well to but they are sort of ugly and it is easier to clean up the engine bay with the car intakes,also the $difference between a Fast and an LS6 will buy some more go fast goodies!
