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Friend is currently building one to defend his world championship title in Gymkhana Grid
Not trying to argue, but your friends car, as well as the driftcar (mentioned further up) IMO don't count in what I am talking about. Especially as I doubt much is left from the original mx5. As a point, when friends did grass tracking the cars were homemade space frames with just the outer skin of the car. Nova (vauxhall) became mid engined rover k series cars.
Many reasons, the LS isn't a heavy engine.
Friend is currently building one to defend his world championship title in Gymkhana Grid, he's pretty confident it will be better than his supercharged 1.8 was, otherwise he wouldn't have spent so much time and money doing it.