Re: O2's and shorty headers
I have the stainless emission's longtubes with AIR and EGR still hooked up. I put dual 3" cats on it and had it tuned and I had no problems passing inspection in NJ. I guess it depends on how thorough your inspectors are if they can tell the cats were moved to a different location or not. The ASM 3/4 length headers work well and might allow you to keep the cats closer to the stock location. The MAC's may as well. The true shorty headers really aren't a big hp increase over stock manifolds for the hassle involved. Which brand of shorties were you planning on running?
69 Z28 Hugger Orange original factory JL8 brakes, being restored