bro u need to do your research honestly if u want something spool at 3k u will have less power, however if u don't mind more spool time then u can geta bigger turbo with more hp but won't kick in till later... I personally have a greddy turbo kit with a bunch of goodies and to be honest the power is great and not bad spool time at all on stock internals, i also have a skunk2 intake on my 01 gsr.. My buddy shmoo has the same set up pretty much and he is very knowlegable and i believe he told u the same thing about spool time to power ratio.. but good luck, and as far as custom fabrication i hope u have something to bend those pipes like them "brand name kits", i personally like to pay for the name but have a little piece of mind, because those kits were desgined by enginners, and know much more then you and I.