Ok I got the truck and swap all done! Now I need a tune. The computer I have is the 99-00 model computer forget the number of it. But its tuned for a 5.3 and I also need a couple codes deleted. How much do you guys think I will gain from the tune? And the big question, everyone of mine and my friends ls1 cars and trucks we have taken to Tue Dallas area for a Dyno and street tune for 400. My 6.0 is pretty much stock for now but will get a cam swap this summer. So mail order tune or save money and have a Dyno/street tune?? Thanks guys!