Yes, we know that that GM produced a Chevette-based pickup in South America, thus giving the world a factory Chevettamino. But the coolest T-platform compact that GM ever sold is likely the Vauxhall Chevette HSR. Featuring a 2.3L slant four with a DOHC 16v head, the HS and the later HSR were homologation variants for rallying, and well, just look at it! SUPER BADASS BRITBOXSHITBOX POTENTIAL!
Chevette HS [Wikipedia]
Related:
The Joy of the T-Body! [Internal]