Stock for now but I was wondering which tune would be best. SCT or Diablosport? Thanks for the input!

 

We have thoroughly developed the tunes for the new GT500 models.

Gains are really strong. The provided tunes will pick up a solid 35+ rwhp on your 12 GT500.
Massive gains of 80+ rwhp can be seen with a pulley, CAI, and the pulley tune

 

Thanks Mike! Are the tunes pre-loaded for stock and pulley or should I just wait till I do the pulley and other mods to buy the tuner? thanks

 

Yes, there are preloaded tunes for 91 and 93 octane and 91/93 octane pulley tunes