I put in a new BTR stage II cam in my GT. I love the sound and understood that on a stock converter it might be pushing through it. My only concern is the idle. The company that tunes it said he tries to find the lowest RPM before it dies and then tunes it up a bit higher than that. He said that once it gets to optimal temperature it’ll idle better but other than that the RPMs drop low and then come back up and it doesn’t sound right to me. Even after a spirited highway drive, going to turn it back on it falls into that weird mode. Maybe I’m over thinking it but I can take it back to be retuned. Seems they forgot to replace the engine cover as well.