depends on the restrictions of the m3. last year the m3 won 6 oout of 8 races and took the manufactures championship even though porche outnumbered bmw 4 to 1 at most races. this year however the m3 will carry a 220 pound weight penalty and a smaller resticter do to the fact that they have only produced one version of the street legal version. bmw says that with these restrictions it would make the car so no competitive that it wouldnt even bother racing the car. but clearly the m3gtr was the superior car last year.