I have seen websites (ebay I think is one) describing the SP as "PRO".... this is just wording from the retailer to indicate its the top end model.
I have also seen ebay retailers using SP in the description of the RTR version which is just nonsense.
Read the threads here and you will find there are two versions of the SP... the older one is an orignal zx5 kit with a conversion pack, the other is fully retail packaged as SP. Both are good value, I went for the fully retail packaged SP -it comes with proper socket head screws and shock bodies with extended threads, but no one way options included.
If you buy the conversion package you get the all one way option parts but cross head screws.
Search the posts int he forum to see the exact spec differences.
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