Haven't posted in 9 years but have a question that hopefully someone can help with.

I have a MK7.5 Golf R with an APR intake, APR stage 1 ECU tune, APR stage 1 DSG tune and just recently fitted an Xforce catback with Varex.

The car burbles on overrun in race mode and individual mode with certain settings but if I stop the car and turn the engine off the burbles are gone when I restart the car. Sometimes the burbles just stop in the middle of driving.

The workaround I have been using is to just switch between modes while driving or on restart and this temporarily fixes the issues and makes the burbles return.
I am assuming the ecu is making adjustment based on exhaust temp or similar but I can't understand why more people aren't having this issue (or are they?).

Has anyone else had this issue and been able to resolve it?
Thanks in advance.