E92 M3, How would YOU have done it.
The way I see it...
3.5Liter Inline 6 with a 8500rpm redline or more and a 100-150kg weight reduction. SMG3. Optional bucket seats. Ferrari style manettino switch on the steering wheel, with rev counter on the wheel Ferrari style. Multi caliper brakes with optional CC brakes and optional Pilot Cup tires. A button to remap throttle and fuel injection and exhaust from "street" to "track".
The 335 would gain a ZHP or iS version with 340hp and LSD and become a "soft" M3 that we got in real life.