Well come on out to the NSW production car champs. There are standard commodores (300kw, 6.0l), evos, wrxs, falcon fpv, and my poor old 20yo gtr running around.
The GTR has not been beaten in a race it started (I only did the first 2 rounds). http://www.ctcnsw.com.au/reports.php
We have 6 rounds next year between Wakefield, Eastern Creek and Bathurst.
As for 32 v 33 v 34 stock for stock.....each of them made 206kw and the 32 was lighter. Sure the factory spec 32 is quicker. Of course there is very little stock (or even if stock not in good original condition) still getting around these days.