For the Challenger, the current offered tunes don't add any more significant power. I have dyno sheets from Lloydz, RVS, Hoonies, Dynojet. You might get 2 -5 HP tops and a couple of ft pounds of torque.
What the Challenger tunes do offer, is better drive by wire throttle response. Removal of the speed limiter and slightly better timing profiles. And better idle performance.
What happens is the drive by wire tables are more aggressive in the 50% and up throttle twist, which tricks riders into think they have more power. They don't it just comes on quicker.
The EPA doesn't really care about open loop operation, and that's where the majority of most tunes are done anyway. The current Dynojet and Lloydz tunes are most likely EPA compliant anyway. It's just they haven't been certified yet.
The tunes for the 111/116 also didn't mess with the closed loop operation, which still is the lean EPA AF range.
Also buy having a EPA compliant tune, this will get you out of the warranty being invalid due to non EPA compliant tampering.
Dynojet and Cobra and others have been making CARB compliant tuners for years.
