Please. please, please do not become a part of the growing problem of overly bright lights that blind oncoming traffic. REALLY bright lights sound great when you are on a dark rainy road by yourself, but are patentedly unsafe when they keep oncoming traffic from seeing clearly.
There are direct replacement high/low bulbs with halogen brights that light things up nicely with dimmer low beams that are safe. They require no extensive relays and rewiring.
Thanks for your consideration.