Bit Clio biased here, but either:
a) Renaultsport Clio Group A rally car (using either the Williams or 16V engine) - shows how good a hot hatch can be; 1.5 seconds per mile quicker than the 5 Turbo Maxi 350bhp Group B car - in 2.0 NA FWD form!!!!
b) Renaultsport Clio Maxi Group A rally car - RIP; there will never be another
c) Renault Clio 16V and Williams - translate rally glory into B-road supre road cars