I don’t really notice a power difference, just a bit more torque in the higher rpms which is normal and no gutless feeling in the lower rpms. It pulls pretty good all the way up the rpm with no noticeable change when the light goes off. And to answer your earlier question of does it matter what gear...

The cel comes on and stays ON when I start the car. The cel turns OFF about 4-5 seconds after the rpm goes over and stays above 4100rpm. As soon as it goes below 4100, it turns back ON. And the cycle repeats the 4-5 seconds when I go over 4100.

Was this ever resolved? I’m having the same issue on my FX16. Check engine light turns off right at like 4100rpm and as soon is it drops below that it turns right back on. It originally turned on after I did a burnout/hard pull. I was wondering what was done to fix it. I get codes 6 and 11. I checke...