The SP was introduced by Kyosho in at least 3 guises, (1) as Law35 - a bag of bits. (2) as an addition to the kit - you got the bag of bits plus the original kit and (3) later as the SP kit. Somewhere in there was the "middle" (law34) conversion that introduced RB5 rear suspension, some SP cars had newer shock parts (RB5 tripple cap shocks) and some missed out. This is why a lot of confusion still exists, just look back over the Kyosho section.
Mostly the SP changed the front hub, this also needed new wishbones, driveshafts and new wheels with a different hex and offset. Some say it improved the car, and I am sure they are right.
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