Can share what Monster tune use to tune or flash Opel or GM vehicles ?
I plan to go MonsterTune but waiting for more fellow owners to go together. Maybe can get discount.
As far as I know, Racechip and my method are the only two OBD tuneable software available for GM vehicles. Others may need direct access to ECU which require more items to open up. Mine cannot be seen or know visually unless you put it on dyno. Then, I can put it back to original within 20mins. 😀
I believe my numbers are slightly better than Racechip numbers.