how much did the diablo tuner cost,my 4.8l will **** and get pretty good i believe,from what wikipedia says,my 4.8 is purrin out bout 275hp and bout 300ft-lbs of torque. but i would like a lil more grunt on it. I did find a site called GFPerformance chips, claiming to add 60hp or more and for only $69.99. didnt know if anybody else had heard bout it or has any input seems legit..