Well, i will say this much. Last time we tested, we first did one run with my xx4 with a Speed Passion 5.5 motor. Then we did a run with the SX and a similar Speed Passion 5.5 motor - and it isn't printable what i said as i went down the main straight on the first lap with the SX.
I'm not going to claim it is purely car - but i will say that on that day on that track with similar motors, the SX had more straight line speed than my own xx4.
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Matthew White
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