what is the most commom used rr spring people use in the real hard slick tracks befor it turns black to keep the car from sliding out??? we have tried about everything and i cant say that i could tell a defference from night and day between then we run a #225 about all the time, tried a 250 a little and didnt see any gains, last year in a old rocket ran a 200 and it was decent but have not tried in on the new frontend rocket?
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