My fave competition version is the MG Metro vs 6R4
Standard 'MG' Metro
(1275cc A-Series engine a-la original Mini Cooper)
And the winged monster
(mid mounted 24v V6 good for 400+ bhp, 4wd) - 0-60 in under 4 seconds. On gravel.
One I have posted before is the Droop Snoot Vauxhalls (GM)
Before
After