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On my SS I went with a C.A.I. cai, a Vmax tb, and ADM air scoop for my intake. All bolt ons. The air scoop takes a little time to install though. For my exhaust I went with Solo high flow cats for better sound and some rwhp. The cats, cai and tb are bolt ons that if a problem arose you could quickly r&r them before taking it to the dealer. Remember any aftermarket mods can technically void your warranty. There are no cai's that are CARB legal and neither are the cats. You do not have to do a smog for 6 years on a new car. If you ever plan on doing LT's then don't do the cats. The LS3 cats ~15rwhp are $575, C.A.I. ~15rwhp is $399, a ported tb ~0-5rwhp is $150 with a core exchange, although I kept my original just in case, and a scoop a washer bottle relocation kit is $150. If you have the factory NPP exhaust option and never will do LT's, which are not CARB legal, add some high flow cats for an even better sound and some real hp gains. It's been awhile, but I do miss that good old Santa Maria tritip.
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