I run my b4.1 at the stone and would have to say while others have mid motor I don't see it crucial for me as there is plenty of room for driver improvement first, and am still up there with mid motored drivers of the same ability. I would highly recommend (as others) weight at the front makes a huge difference but not as important a as the correct tyres I would also recommend running as low as possible too. Power is not key to good times consistancy is, although I do love my thunder power 7.5 motor and Orion speedo but have to say I'm a better driver with 10.5 motor, just live the Power.
Enjoy
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