i think it depends on the "BASE CAR", meaning the car u sharked it over...
for example if u have a daihatsu (or however u spell it) in the first car slot and shark the diablo in- it'll handle great, but i tried doing it over a f94-s and the handling was horrible, i guess when u shark in the diablo the old settings stay (suspension, gears, etc)
but the best is sharking it over a r-390 race car, i have yet to try the road car tho....
hope that helped N00B!