I have used all three. T45, T56, TR3650. - T45 vs TR3650 I was happier with the way the T45 engaged. The T56 is the best of the three in stock form but built up its any of the threes ball game and it comes down to preference. Zak from t45 Source built up my t45 to handle approx 750rw and I love it. Do not even want a T56, its perfect. Butter Smooth.
He also builds tr3650's and they can handle the same amount of power, he even has a higher stage for the t45 and tr3650 to handle 1000rw!! If you race on the stock TR3650 or stock T45 it will have to be pulled again sooner then you think. Get the Lowest package offered for moderate racing. Its perfect for you. Youll be very happy with his work.