the SP has different front and rear end geometry for improved handling. I had the original ZX5 and it was very competitve, but haven't tried a new SP. I think a few of the parts have been bulked up for strength on the SP such as shock mount brackets, wishbones etc. Just a logical revision of the original car. I imagine the original kit if still around will be peanuts, but the Sp will be a good car if you car stretch to it.
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