Remember that an FS conversion doesn't contain everything to build a car to true FS geometry and specification (you will need UMW519 hubs and a couple of extra bits too).
As for if the SP is a good car then yes ... it is definitely a good car (I used to run well with mine next to CAT SX, B44 and Yokomo B-max's and as they haven't changed too much then there is no reason why it shouldn't still be able to race well against them.
Is the FS/FS2 better? Yes it is, nicer balance and easier to throw at the track.
I say run the SP until you can get your hands on an FS then make the leap.
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