To get 400+ bhp you need to get the extra 4injectors wired up cos their not from memory and the ECU played about with?!

But as said the block was vert different including smaller core plugs which makes them easy to identify!!! The throttle body was bigger etc. Dont think the head was too different but could be wrong on that!!!

But pretty much easy to get big power out of them hence ppl used to go the 8injector route a while back!