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I found a video where a guy was incrementally adding bits to a Grasshopper (I) - and thus making it 'almost' a Hornet. He was doing laps of a circuit each time and comparing to the Hornet, but when he added the 540 motor the Grasshopper was almost undriveable :) I think either a Frog or Sand Viper (which both 540 motors as standard) would offer a good challenge to my mates Holiday Buggy :)
I do LOVE Sand Scorchers - but they are just way too expensive (and don't handle that well either so I've seen)
Can confirm that a Frog/Grasshopper/Hornet with a motor slightly too powerful for the chassis is an absolute hoot!