there are a couple of sr20de powered 1200's doing club car events in nsw,in improved production.you can't cut the firewall or transmission tunnel in this class,so you shouldn't have to do that.it'd be better to start with an auto car,as these have a bigger tunnel,& the stock sr20 box is ginormous,& very long.figure on having the passenger in the back change gears for you,if you use the stock box.there's probably some way to get a stumpy box behind one,but just what bellhousing you'd use,i couldn't say.