I recently replaced my stock bulbs with 9004 PIAAs...can defenitely tell a difference when it's very dark. It's a whiter light, am able to pick out my X in traffic by comparing headlights. But what a pain to actually do the job...what engineer put the radiator overflow and the battery box directly behind the right bulb socket? I got my PIAAs for $60/pair at Eastern Offroad in VA Beach.

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'01 XTERRA SE 4X4
Just Blue
VA Beach