Hello,

I have a G63 AMG 2021 model (EU) and recently I installed the Akrapovic link pipes (replacing the OPF filters), as well as the Akrapovic muffler. I also bought the Renntech HHT and flashed the ECU with the updated/tuned map.

I have a question though. So far I didn’t have any check engine light, so all OK, but if I revert the tune back to stock (through the HHT) will I get a check engine light because of the OPF missing?

For the US folks, the OPF is something like a resonator.

Thanks!