He was lucky to just destroy the muffler, rather than watching the pistons peed out of the block. Only morons rev a car that hard without any load on it.
Just assume our cars are fitted with catalytic converters, and therefore need to control the fuelling more accurately, especially on the over run, so exhuast flames don't happen. Maybe one day Scawen will add it, but it'll probably be an S3 thing now.