Twin sorry im not an american
just happens to distribute both polini and mk in my country.
Anyway in my opinion, untuned i will go for the Prorace kit... why because its exhaust port area is bigger than the new evo2... bigger with RIGHT measurements means more exhaust gas will flow out... right? correct me if im wrong.
but the transfer port openings of the evo are bigger than the Prorace... in my understanding more fresh gas to the cylinder...
but if you tune them both.. the evo2 will be alot easier to tune than the prorace... I have both factory tuned cylinder kit in my possession the Evo and Prorace. i did compared them and you need a lot of work on the prorace.
Butch... its down to your preference which brand do you prefer. I had 2 MHR Speed Kit, 2 MHR Lc kit, 1 MHR AC kit. still i prefer the Prorace... its more economical on my part (it doesnt eat piston and rings the way my MHR's do)
Right now 5 races all of them 1st place, including practice and yet I havent replace anything on the Prorace even the rings. Competition did include full MHR team set ups and 125cc Honda dio's. And I also sell Malossi parts