Stumpy, none of that sh1t works, I thought you knew that? What is that like 3 grand for all of it? Will it amount to 15hp? The hot-air kit will just take it away and fill your motor with dirt for good measure.

The 5.7 from the Factory is as perfectly tuned as it comes. In '03 when Hot Rod went through the new engine with a fine-tooth comb it was pointed out the factory manifolds flow within 2% of a set of headers.

If you really must have headers, 6.1 factory headers come up all the time on Craigs List from some Meathead duped by some header advertising. Usually $100 can get them and they won't leak like that aftermarket crap.

The rest of your laundry list, well pick one at a time and just Google "Problems with ___________" and see what comes up, I don't have time waste on it, seen enough of it already.