GT Planet.com (GTP)
GT Planet.com is great because it features news on the upcoming projects Polyphony Digital
has going on, active message board, and a great community.
Gran Turismo Wiki
Mad Finn's Tuning Shop (GT4)
Mad Finn's Tuning Shop (GT5)
Going for a drive in GT4 or GT5 and need a tune? Check the Mad Finn's
Tuning Shop! If it's on their list, it's generally a guarantee your ride will leave their shop driving and handling
better than it drove in.
GTP North American Car List (GT4)
Quick Car Reference (GT5)
(includes Standard, Premium, and RM indications)
Gran-Turismo.com's Car List
GT5 Prize Car List
Pupik's GT1 car site
Pupik's GT2 car site
GT3 Car List (GT Vault)
Pupik's site is jam-packed with car specs, hybrid codes, a great FAQ, and other goodies.
Easy to navigate; I wish he would make a GT4 site. :(
A detailed Route 246 Photo Blog