Was calibrating at 2015 Z with manual trans the other day with bolt on's. I was modifying the Torque Coefficient Models for Airmass Based A-D to resolve a throttle issue) which solved the issue, but it caused two other issues. The car had a Corsa exhaust with the exhaust valves deleted when it came in. After calibration it started getting a code for the exhaust valves (which it didn't have prior) ....then once off the rollers it would trip to REP at low rpm high load tip in....I chased it around for a bit and decided to return the values back to stock....both issues went away. This confirms that the valves for sure operate off a torque model somewhere. The REP must be from a limit not matching the TC change but I couldn't find which one was clipping it...anyone seen this effect...I might of just needed less of a change by these coefficients are a crap chute since the values are just that..