i would like to know what can i do to my 03gti turboto make it really fast. and were can i get a chip ecu .
also if the ecu of an auddi 4 would fit the 03 gti turbo.

 

I called GIAC and found out where the distributors were, and they flashed my ECU with the program.

You could get performance cams, CAI, Cat-back/turbo-back exhaust, or maybe bigger fuel injectors. My advice would be to look at some Eurotuner mags and see what has been done to cars exactly like yours. You can get some pretty good ideas from the magazines, but bigger turbo is an option, too.