BTCC - Rouse Kaliber RS500. remember seeing it at Birmingham superprix when i was 4, fav car ever since. the noise of these thing at full chat down the straights was just epic.
Group B - 205 T16 EVOII
WTC - M3 EVOII
F1 - 87 Williams Honda Turbo
GP500 - Schwantz Pepsi RGV500
WRC - Kankunen Valvoline WRC Escos
ATCC - Johnson Shell RS500

theres loads more but there the ones that pop to mind