Hi Nick
Spares wise I would look at front and rear wishbones, spare screws for the front suspension hangers, 'o' rings for the wing and an upgrade to the new black spur gears to start with.
The gears that alter the internal ratio are the gear by the slipper adjustment and the white nylon gear adjacent too it. In kit standard both gears have 33 teeth (2.6 internal) but can be changed to 34/22 (2.8) or 32/24 (2.4). The thinking is the lower internal (2.4) will lead to a more dynamic feel when coming on throttle.
The CAT SX, once tamed, is a very good car.
Andy
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