Have a stock 92 GT motor, planning on doing engine work within the year, heads,cam,intake,injectors,etc, keeping the stock block and working up pretty much, wanted to know what would perform better, 1 5/8 or 1 3/4?? im going with the longtubes, just wanted to get an opinion on the size, and as far as the rest of the exhaust, a 2.5 inch or a 3 inch? anything will help, thanks!