2004 gtp 3.8 bottom swap- Needing a tune!!

[jsgibbs1203]

I had my motor go in my 2004 GTP and I swapped in a a Nonsupercharged lower end and put all my heads and intake and supercharger on it. What do I need for a tune? Will just a mail order tune get me done? Looking for a good tuner

[GTPpower]

I had a comp g that I did the same thing to. You are going to need more than a tune though to keep it from knocking. You will probably need headers and a bigger pulley, or a cam, or an intercooler. Or switch to e85.