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I would not recommend the J Costa variator as stated above by Chris there have been a number of problems reported relating to their short life and physical damage to the engine crankshaft. The latter caused by what was an odd design decision, that the bell is not splined to the crank and that unlike the OEM variator there is no positive drive between the movable pulley face and the crankshaft.

On the stock unit the ramp plate is splined to the crank and drives the movable face via four dampeners providing a positive drive. In the photo below you can see that the bell on the J Costa unit is not splined; it is held only be the force of the crankshaft nut clamping the fixed pulley, bushing and bell to the crank. Also as there is no provision for a positive drive between the bell and the variator pins/pulley face, it would be a very poor design even if the bell were splined as only one pulley face (the outer fixed face) is positively driven...

 
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