Being all plastic they don't suffer the weight problems of diecast conversions.
Far from being top heavy they sit on the track well. The top is mainly full of air anyway.
I found the F430 mine are based on did 6.0 seconds around my old track and the transit conversion did it in about 6.4-6.5 seconds. Having said that the Ferrari deslots more than the Transit (maybe due to higher speed) but when the Transit overcooks it, it tends to stay in the slot and stall slightly before coming back. I'm not taking any credit for this though - it is just how it turned out!
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