Yikes, I can't quite remember the size off the top of my head. I want to say its 1 5/16" ill have to go look in my toolbox to be sure. Anyway, if you have access to a air hammer it'll make this job a snap. If not you'll need a wrench and a good hammer and patience.
Bear - 1999 Jeep Grand Cherokee Laredo - 250,000 Miles, BDS 2" lift, Overland rock rails, Dynomax cat back exhaust, 245/75/16 Kumho KL78's, Rebuilt 4.0 @ 244,000 miles.
Apollo - 2008 Mazdaspeed3 - Mazdaspeed CAI, Mazdaspeed CBE, Prosport boost gauge.
Velvet - 2005 Ford Focus ST - Wife's ride