Could I possibly suggest that this is the wheel donor rather than the one you posted?
http://fc07.deviantart.net/fs71/f/2013/084/9/6/extreme_rx7_with_a_hint_of_stance_by_atc_design-d5z7p1g.jpg
It has the same lighting as my wheels, the same custom lip, same spoke position. It even has the same sticker that is on my rear wheel (albeit blurred). None of these features appear on the donor you posted, and the lighting certainly doesn't match. You may have motion blurred it, but from what I can see it looks like my rear rim that has been desaturated and blurred.
If you have just say, I won't be mad - I just prefer you to be honest

That's what counts
As for the rest of the chop, you've done a good job! Firstly you entered! Something which was beyond the majority of members. Secondly it actually works really well - an awesome chase scene with some great lighting
There are mistakes, but nothing too major. The biggest ones are that the wheels on the skyline aren't spinning fast enough, and the radial blur makes them look like they are wobbling. The lens flare also looks quite cheap and spoils the chop a little.
Rest is cool though

Nice one