I can't really comment the chop because it's just fitted to the background on a new pair of wheels, but i can give you a little advice

when a base is so beautiful and you have no intention to change body parts, the best is to highlight the original parts, for example, you could make the exhaust pipes a bit bigger, and make four of them, put a set of M5-6 rims and bits and peaces of bigger and stronger BMW cars

cheers
