Thunder's isn't taking any new members at the moment. Thunder has to clean out some of the old inactive memberships to allow new ones.
I'm the same size as you though I started a little smaller so I know what it's like. Yes, PE (penis enlargement) does work but it takes time, dedication, and discipline to do it right. It's really important to do all the exercises the right way or else you could really end up doing some damage. Some guys gain quickly, some slowly, and sometimes you plateau for a while. Some exercises work well for some guys, others not at all. A tiny handful of guys have claimed to get 3" though it seems to me most gain somewhere from 1" to 2". Early gains are easier to get than later gains though much depends on your physiology.
Thunder's doesn't charge a penny for what it offers however you're free to donate what you like or nothing at all. You still get access to everything after you've posted for a while.
If you're interested, PM me and I'd be happy to send you a copy of the newbie routine so you can try it out if you're interested. Everyone does the newbie routine. If you stick with it for three months then you should be ready to move on to other exercises and, with luck, Thunder will have re-opened membership.