To get that sort of power from an Evo, virtually everything is changed; rods, pistons, crank, head (ported), valves, cams, pulleys (normally switch to adjustable), stand-alone ECU like a Motec or Omex (although a piggy-back like a Greddy E-manage or Apexi Power-FC might just do it) - bigger injectors, water injection, bigger intercooler (maybe nitrous sprayed), custom wastegates and controllers, coils replaced, exhaust. Then there's the transmission; paddle clutch - probably tripple plate carbon, straight-cut box, the Evo rear axle is pretty good, but not sure it can take this much on its own, suspension would need changing. Unless it's a drag car, the brakes obviously need upgrading. I'm guessing it also has to run on race fuel to give full power too - probably more like 550-600bhp on road fuel.

Like all these big power cars, so much needs changing to get the power that the only things they have in common with the originals are the body shell. I run a big turbo Jap import, and know several others running big-power Evos; one over 700bhp, that's used for racing. They look good and the feeling when driving is awesome, but they're f*cking expensive to run (I get 12mpg, and it's in the garage being tweaked about 40% of the time), and need constant attention which is what a lot of people forget.