does anyone know any online sites that sells aftermarket or oem parts?
need any oil pan, wheres the best place to get one.

www.oem-car-parts.com

www.digitalracer.com is your best bet for G20 aftermarket parts!

http://www.infinitipartspeople.com
-(Not much, but a start)

http://www.nissanparts.cc
-(Need to know actual Nissan/Infiniti part #'s to use. Excellent prices!)

http://www.courtesyparts.com
-(Need knowledge of parts that crossover from Nissan to Infiniti)

http://catalog.thepartsbin.com/
-(Excellent resource for parts and good prices.)

http://www.infinitipartsusa.com :D

infinitiparts.net has been a good source for me