There are reasons that 4wd is outlawed in the majority of racing categories, and that where it is legal, it wins... There are the odd exceptions, a few FWD victories in WRC on tarmac in the mid 90s being examples. I spent a year rallying an RS impreza, then went back to an AE111 Levin, the RS was heavier, less powerful and much worse geared, but there was NO comparison, even a fast open downhill stage (Levin had bigger brakes too). I am not saying this is a hard fast rule, and I take great joy in beating 4wds in my 2wd, but it takes some work