why in the world would you want to? a 9006 is capped and will have a very very strange beam pattern. As with putting a 9005 in the 9006 socket you'd have to grind off the guides, but it would suit no purpose at all. It's lower wattage, capped, and would just really suck, if you're planning on driving with the inner lights on be forewarned that the DOT SAE guidlines specifiy the low beam being outside of the high beam. But no it wouldn't blow a fuse, it's lower wattage than the high beam, aside from being absolutely worthless it wouldn't hurt anything, other than the bulb you have to modify to make the plug fit.

Again I ask why in the world would you want to do this? That's it, put the bong down and slowly step away