Lots of slightly different arrangements of steering parts, axles and wishbones & shock parts are said to make the car better to drive, uses a different wheel offset to suit the new arrangements, so different wheels.
If the SP comes as a kit or if you have to upgrade a standard ZX5 I am not sure, we run the original and we are quite happy club level racers.
The reason the car is not used at top level is partly due to backing (or lack of) from Kyosho, no team cars no team drivers developing. There is also a mid motor car that may be available now?/soon.
We have found the original (with the same mods as Jim above) to be robust, with a Novak 5.5 we do not strip diffs/gears or do to much damage, front alloy brace is a must.
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