[thekurgan]

I have the ESS and o-cha is right, they "shouldn't" open the ECU, but for the mss70, there is no way externally to flash anything code; but it does open the door to other issues, electrically that is, so it is a greater risk than say the Shark injector. ESS tune has been flawless for me and others here, the only reason I got it was their 91 octane map and all the issues with the crapifornia gas are gone now. I drove an '07 Imola at my local dealership for comparison, and you grow into the tunes, but driving one without, after having one for a year, it night and day.

There is no way I believe a simple software tune can achieve 20hp though, not at the top, and the ESS 8-12 hp, it more in the mid-range with what feels like an extended top, instead of the dramatic drop.