like all engines now you can tune them to suit your skill level....you can put a 6mm restrictor in a badass motor and make it feel like a cheap OS RG. I say buy 2 needle carbed motor (V-Spec has 3 needles) and a set of small restrictors and start racing. You'll see that as your progressing with your skills you can go to a bigger restrictor or tune the motor for more power.