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cat back exhaust is along way from the valves. LT Headers would make more & Cam would make even more because it opens the valves more/longer and the best is port and polish with bigger valves and a cam.
I agree with the porting/polishing. But you also have to include compression ratio in the mix also. To get the most out of the cam you also need the correct ratio. I told rt that I would not go any higher than 10.0-1. He would also need a wide lobe seperation so that he does not lose any vacuum which leads to other problems. Just my 2 cents.