Yeah thats better BT.
I think the outer bead on the rim is right but its too bright, may want to lower the opacity a bit.
You need some reflection on the bottom lip of the rims also.
This would look really cool with a nice canister exhaust sticking out from under that rear diffuser spewing some flame!
I dont see any difference in the red BTW.
If you feel daring, try cutting about a quarter inch of the right rear edge of the car from top to bottom and placing it on a new layer above the car. Then apply a motion blur adjusted in the direction the car is moving.
Adjust the opacity so its barely visable.
See what you think.