I run the PIAA Extreme 4000k for both low/high beam and PIAA GTX 135 watt H3 in my angel eyes, and honesty they dont look anything like H.I.D. They are a great improvement over stock byfar but they do not have that heavenly glow of H.I.D.
Dont forget H.I.D headlights usally run around 4500k and hotter. If you even try and jack the voltage to the headlamps you will end up burning the wires and possibly melting the lens. I advise putting in the PIAA'* and calling it quits.
Remember it'* a Bonneville...not a Mercedes.