So, I've never even heard of these tuners. This forum is for a less modded platform, my best advice is to search the C63 forum, and see if there are opinions there, and then look at the published torque curvesI need some info on software upgrade. Please send me reviews and experience on upgrades.
At moment I am looking into the Wulfchiptegnik software upgrade or VAG motorsport upgrade.
Please help me decide on what is the best to do?