honestly i did some looking around, and i cant find any good tuners. the tuner that i used previously im not confident in anymore. try amazon in sc (6 hours away from jvegas). or get a tune from a shop and drive down to VMP (what im doing).
good shops
-fastlane
-National speed (iffy)
-majestics (iffy)
-Bnt
-waynes (last resort)
if you go to NatSpeed or Majestics ask hom many s197 mustangs they have tuned and how they preformed.