i need to know what i should do. rite now i have a 2.5 inch milltek. but i have a 3 inch down pipe. should i go with a full 3 inch system. i have an upgraded turbo runnin the gt28rs i feel like im getting restricted at times should i leave it alone or get a 3 inch cat back system and which one should i get. 3 inch atp down pipe with no cat, thats what i got on going into the 2.5 need some advice http://****************.com/smile/emthup.gif