My C63 really struggles for traction even at 3/4 throttle openings in 2nd gear on a sunny, dry day! It does have Eurocharged map but saying that also has a Quaife fitted too so should help a fair bit. It's becoming very frustrating as the power isn't usable at all unless I turn off traction control....
Cars running conti 5's (5P) which I think is the OE tyres fitted from factory? Fronts need replaced soon and was going to go with conti 5's but if PSS have been better for 63 owners might give them a try in OE tyre sizes...