well when i first got everything hooked up just top swap wise with the standard 3.8 it was running horrible and it was slower than any car out there...it took like a minute just to get to 60 and i was throwin all sorts of codes...come to find out the pcm was all messed up originially and i had even sent it away to get a mail tune from 3800 performance but it was runnning like 19* of timing....i dont know if you guys know of a guy named tim who used to work for intense racing but he now works at a place in dayton ohio called TKO performance...he took it and made it so it was running right along with installing some headers and he said it would be safe to drop pulley size so i got a 3.5 inch pulley and he didnt have a hub that would fit it so he just put on a 3.4 pulley and did all the tuning afterwards...i'm thinking he said i'm running like 12-15 degrees of timing but dont mark my words!!!...it's quick...thats all i know...lol