OK,

As a V6 owner who has done mods to the engine, as good as SCT is, it is limited on what can be done to a V6 computer. Mine was tuned by Brian Wall at Wall's Rod and Custom here in MB. He is one of the best for this type of work. He has gone back numerous times to SCT to get the best tune possible for my car. I'm hoping that new O2 sensors will fix the issue I'm having. Brian did mention he felt that Diablo may allow for better tuning for a V6 computer.

i have one more question. what harm will come from choosing a 91 or 93 octane setting on the programmer with 87 octane in the tank.