When summer arrived I noticed my A4 1.8TQMS WETT stalling when the rev's would drop (eg. when putting the clutch at lights, to turn left, etc.) when the A/C was on. Put stock chip back in and there was no problem. I email Kelly Kay at Wetteraur, she handled my problem quickly and shipped out a new chip free of charge. Now there is no more stalling! I've really appreciated there service.