Well, being that AFAIK there are no 80w OEM bulbs (closest is a DL50 - 50w OEM) - it's probably an ebay kit, which brings serious doubts as to the quality control, not to mention whether or not the ballast really is 80w. OEM bulbs have a certain kind of glass around the capsule to block UV, which will wreck your polycarbonate lenses. Many kit bulbs do not. Your biggest issue is going to be beam pattern. If 35w HIDs in a headlight that isn't designed for them is a bad idea, then 80w is even less of a good idea. Even if the headlights survive the heat, they will not produce a proper beam pattern.
What headlamps are these? H3 and H4 is an odd combination... makes me think that it's a poorly designed knockoff (or possibly an integrated foglight), since H3 is mainly a foglight or ebay projector bulb, and H4 is a hi/lo.
However, if you have a 35w OEM HID setup, a few people have found that regular old 35w Philips 85122 bulbs are capable of running pretty well off of a 50w or 55w ballast. There is some reduction in life, but they still last more than halogens. Of course, the 'right' way to do something over 35w is to use a Philips DL50 fatboy, which is a kinda hard to find, expensive HID capsule designed for 50w.
