help for a neewbie ......

[rip170]

Same for 4.8, 5.3, and 6.0. ECU's are different though. Well, same ECU, just tuned differently. I think the LS1 ECU's are the same actually. Wiring harness is different though.

So I will still need wiring harness for ls1 or 5.3? And the 5.3 ecu or 5.7 ecu

[myzterray]

So I will still need wiring harness for ls1 or 5.3? And the 5.3 ecu or 5.7 ecu

i would suggest getting all your accesories and intake then go from there. takle the issue as you get to them. if you get a custom harness made you can just let them know what you have and they will make one and tune the pcm and everyhting. nelson is the best uve heard of. not cheap by any means however