CATERHAM SUPERSPORT K-SERIES. Do you really need a 620R for the road?!

This Caterham Supersport runs a 1600cc Rover K-series engine, high lift camshafts, lightened flywheel, 6 speed close ratio gearbox, LSD, AP racing brakes and master cylinder, dry sump and Bilstein wide track suspension. Weighing around 520kg, producing 135bhp and sprinting to 60mph in 4.8 seconds, do you really NEED a Caterham R500, 420R OR 620R for the road?!   / the_fuel_factory_