Nice chop m8..
i think the Rims coloring is too bright.. try to use the HUE or COLOR effect on the Layers box..
something not rigth .. the BG is a garage scene wich is Indoor right ?? then why did'nt you change the Reflection in the side glass.. it's a sky reflections not a garage reflections ...
also the overall Reflections need to be Distrot and Liquifyed ..
try to use my Video tut's at
http://www.autemo.com/forums/?t=344
keep up