Spoiler alert. the 4wd does not win. :)
This is my 2wd slash, All RPM with AKA 17mm adapters running offna wheels and Duratrax Lockups tires.
The 4wd Slash belongs to blaze. I'm sure it has something under the body. I'm guessing a motor and some cogs or what ever. Maybe a few evil clowns dancing. Who knows. I just know it did not win. :)