forums
986forum.com
renntech.org
boxa.net (uk)

resources
986faq.com
​mikefocke.com
​​cb-racing.com
​
diy info
pelicanparts.com
​pedrosgarage.com

part manual
porsche.com

part suppliers I like
(no affiliation)
​sunset porsche (oem)
​pelican parts (oem & aftermarket)
ecs tuning (oem & aftermarket)