sorry for the OT but ive been in both a r33 gtr and an bmw m3 (millions of times coz my mates dad owns one) and i would have to say that stock, the $150,000+ m3 would absolutely rape the $40,000 gtr (how much my friend paid..). im sorry to say that coz i am a huge skyline fan but the straight 6 m3 is just unbelievable...
Now to ur renders.. well done man,, both look really well modeled and rendered

hope to c future projects soon!!!
EDIT: just reolized u modelled an e36.. my friend has an e46.. well both r still awsum