these are the ones that i read/post on on a regular basis

la4x4forum.ipbhost.com
ar15.com
bayoushooter.com
edcforums.com
fullsizechevy.com
getonitracing.net
nostreetracing.org
pirate4x4.com
rimfirecentra.com
rocketmadness.com
snipershide.com
sportsnimports.com
thefiringline.com
thehighroad.com
candlepowerforums.com

and some other site