I put 555's in mine a few years ago with Fullsac X pipe, Kerker Stouts, 30T and a map from Steve at Fullsac and got 98 hp and 106 lb ft of torque.
I'm in the middle of an upgrade with information from this site and a couple of VERY informative phone calls to Steve at GMR to his 600 cams with a 113 piston and jug kit (not his), beehive valve springs, SE 58mm throttle body with 5.3 injectors and the S&S flywheels. So we'll see where I end up. Unfortunately Steve is in Texas (I'm in Washington) or my bike would be there having all this done. Thanks for your time and patience Steve.
As for the Woods 555"s they work great and I would recommend them, but a call to Steve @ GMR I would recommend even more.
Sorry for the hijack.