I have the piggyback Accel DFI Gen 6, which is not as versatile as the current Gen 7--Windows based and with full timing control. When you purchase it from HRC, it comes with a "base" fuel map, which runs quite rich. Having access to and the funds to dyno will be helpful (maybe that's why I'm still running HRC's fuel map :-( ) Being able to trim or add fuel per fuel cell at a certain boost level, load %, and RPM is awesome:thumbsup