U say your ecu has coloured hearts/diamonds on it??

pre 90 spec ECU's have coloured sqaures, 90 spec have heart, diamond, hash symbols printed black on the front.

Your fuel pressure regulator, a standard car doesnt have one, its sprung loaded inside to give a preset pressure, i believe tuning companies however do run a pipe to this to increase fuel pressure at high boost.

I'd speak to a tuner before you try it however (if you are going to)