A mate had a 2.0 8v with cam, big port head, full rebuild including lightening + balancing, and twin weber 40's, that made 150bhp, and in the mk1 it was rapid and very revvy. He used to switch off engine @ speed, pump throttle and re start engine for the loudest bang ever, forget a normal backfire. Used to sound like the backbox was gonna blow apart at the seams!! Was the best thing for sh!tting people up, followed by the roar of the carbs, did it for years and never missed a beat.