Just bought a Granatelli/DiabloSport Predator Hummer H2 Tuner from ebay advertised for "03 H2".
Q1: Any prob/incompatibility if I use it in 04 H2? (Granatelli website doesn't seem to indicate diff product for 03 or 04?
)
Q2: Best setting anyone has while retaining 87 octane? (in SoCal, even 87 is above $2.15
)
Thankumuch!