Rubberbanding is honestly the worst part of FH4.Yeah, it's awesome. There's a tune in the store somewhere, which upgrades all the stats to 10. It becomes insanity. Sticks to the road like glue, hauls ass like the devil's on its tail, and accelerates so fast I'm surprised the wheels stay on.
Do note that it's not fun to use in races, though. X races are never fun, and while it will beat pretty much everything you throw at it, it really is no more fun. Also, the rubberbanding just makes the AI break all rules of physics.