Drove my friend's STI a few years ago.
Turbonetics turbo, fuel management, ignition management, and e-adjustable waste gate. It had guts! Scary fast @ 435bhp. It was just a toy compared to his GSX Eclipse @ 612bhp. Either one in stock form was formidable in the streets, but with his mods they became scary to drive. He sold both about a year ago to start a 1100bhp 04 Skyline project.
Makes me wish I could find an idea to patent, then sell the rights for 7.5million!!!