My B5 Avant is going in for surgery in two weeks (AWE K04 upgrade) and I was wondering for those thatve done this upgrade have you had any issue with your diverter vales failing. Also would upgrading to a 50/50 valve cause any check engine light issues. Ive read that the system is a closed loop and these aftermarket valves can cuase issues.

Baseline tests this weekend!!!

Thanks
Reg