The PIAA bulbs have a more uniform beam pattern than the stock ones (and are brigher), but the light doesn't really spread out any further.
I replaced the fogs w/ the PIAA 1500XTs and spliced into the wiring right at the light...the stock wiring/fuse/relay can take the 55W just fine.
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gothamist -- MAXC member
http://www.beatdriven.com/xterra.html