I think you are asking for trouble as install torque is only 22# IIRC. You need to break the corrosion w/o damaging. New cats or r&r the headers will be more expensive and/or more hassle facing even more corroded bolts... Instead, use PB Blaster or the like to hopefully penetrate. Hit it a number times and maybe let sit overnight or for a day or two. Also, if you have an advance auto nearby, they have a loaner program for the O2 tools. Basically, you buy the kit which has 3 options... crowfoot socket and two others. You use and then return w/in 30 days and get full refund. I used it this summer and it was only $30 which I got all back when i returned the set 2 weeks later.
Good luck
