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!!!