I have a pIII for my 6.0 and I nearly went postal on the guys at Htech. I am filing a complaint with the BBB. I wouldn't use one of there products at all ever. I alos am calling my State attny gen. I paid over 400 for mine to get a similar story from them they wanted $250 to reprogram for the new truck.

I now run a van aaken and even though they went oob its still better than htech

 

Just wanted to add that I just purchased the Diablo and it's a nice product. I'm using the 93 setting though so I can't vouch for the lower octane setting performance. Firming up the tranny shifts alone has made the truck drive nicer and I think I am getting the 30HP they project for the V-10. Good luck with your decision.

 

diablo for me also. used them on both my 05 v10 and my 07 mustang. thier 93 tune for the stang is so strong i need slicks on the street. but then 440rwhp in a stang body there is now way not to smoke the tires at any time.