I don't like to reccomend one car over another too much, but the 501X was definately easier to get on the pace. The car needed no work really, the only thing I added was a front one-way, personal preference. The 501X is also closer to what the (UK) Yokomo team drivers (and others) are running, with lower rear ball studs, good shock lengths, flat chassis.
The BX felt to have too much grip for high traction surfaces when I raced it - something that the team modifications have sorted out. With the right setup both cars are pretty equal I'm sure - it's just that the 501X might be easier to get there.
Yokomo have a proper distributor over here and strong racing team, where Tamiya don't, so thats always worth considering if you want to race the car competitively.
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