wht size is the nut hold the o2 sensor to the cat??? i was ready to take off the cat to install my testpipe but found out i didnt have a wrench big enough for that, so i gotta go and pick one up. thanks in advance guys!

 

22mm

 

orrr 7/8ths inch. if you can't find one Ken, give me a call. ill let you borrow the wrench i always use for TP installs/uninstalls