If buying new then get the SP2 and 2 packs of UM521 wishbones & UM510-02 axles (or UMW502 axles for Proline wheel fitting). With that combination you can build the car out of the box to both SP2 and SP geometry to find which suits you.
Original car is VERY locked down at the rear with good steering.
SP is a little less locked down at the rear (still much more so than a B4 for example though) and with very good front end bite / steering
SP2 is slightly looser again on the rear but still not quite as much as a B4 but with amazing steering.
For me the SP suits better than the SP2 but it's all down to how you like a car to feel, Kyosho are the only company out there to offer so many options to it's drivers to get the perfect car for them. I'd also advise an Atomic Carbon rear tower but that is down to my preference again and it is certainly not an absolute requirement!
The RB5 is an amazingly stable car and doesn't need much tweeking to work on grass / astro and dirt equally well. Only surface I make big changes on is carpet but then again I race on carpet so rarely that I'm not the best person to ask for advice on that surface!
Please feel free to ask for any set-up info or parts guidence.
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