The Gen III LS1 engine factory-installed in '98-'02 Firebirds, '04 GTOs and the Gen IV LS2 between the fenders of the '05-'06 GTOs are excellent powerplants. Current LS2 engines are rated at 400 hp ...

In our last installment, we tackled the installation of Stainless Works' gorgeous 1 3/4-inch primary long-tube headers, but what good are these great headers if we choke them up with the stock exhaust ...