im goin with the T-rex and i called PCMforless and they said they could get me to where i wanted to be and within 5-10RWHP of a dyno tune....but my question is with this big of a cam is drivability gonna be decent with a mail order tune?...i mean what makes good drivability in a tune and why cant a mail order tune do that?

 

No drivability will not be good and your A/f will probably not be close.Svae your cash and take it to a reputable tuner with a dyno and wideband.

 

I would do PCMforless, they will be VERY close. Beat Ed Wrigths chip by 25rwhp