Like the others in this thread have said, stage 1 just felt like it had more get up and go. It was fun. Stage 2 feels better in the high end, but not so much in the low end. Something else that I’ve experienced and should reach out to IE for is, at times, it feels like my tune isn’t active. It just feels like crap. My oil, plugs and coils are good. I’ve flashed my car back to the factory calibration, then installed stage 2 again. It felt good, then eventually started to feel like crap again. By crap I just mean sluggish, where you know something is off.