A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.
Just playing around trying to get a more enhanced turbo without ruining Reiza's already excellent sounds, in car only sounds have been modded as I think the externals are brilliant as they are. Tried to somewhat model the sounds on the 2017 Ferrari engine??
Extract to your installation folder.
Backup your originals first or if it all goes wrong I have uploaded the originals here.