Thats another good point, tho the convirtible is veeery cool looking, the Coupe is a shitload better as a car.
Regarding supercharger kits, TDI do one (its pretty comprehensive but keeps std engine, for 7500quid, 385bhp.
I reckon a really good tuner could sort u a 1 off conversion for far less tho, TDI are expensive.
They no performance bargain to mod, but they a really really nice all round car.