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Long tubes and X pipe here, cai, cat delete. I put on an EdgyVette stock ported intake. Gained maybe 10 hp midrange, 2 hp up top, but moved my power curve up about 700 rpm. I was disappointed at thte lack of power gain up top, but for ~$300 it was cheap enough and very easy to do. Moving peak power up that much, to me, was the best gain.
I measured the ports against my stock intake. It was no more than .020"- .030" of material removed. But it did make a difference.
OEMs are typically quite good... much better than way back when. Hence, you're looking at a relative hassle for very little payoff on an otherwise stock engine.
i had the LT2 on a camaro. the msd still beat the LT2 every time and inflates the difference as power increases. peak numbers will be about the same but the msd will pull farther in rpm. not much use on a car with a factory rev limiter. a ported msd will do quite a bit better than an LT2 everywhere regardless of mods.
i sold the camaro and am starting a new project. no hood clearance either, but cowl hoods available and no issues with actual cowl clearance.
i currently have a ported hi ram, ported msd, LT2 and LT1 intake manifold to choose from
my camaro picked up almost 3 mph going from a pray ported LT1 to a mamo ported msd.