best way to shift burred back box nuts !!!

[SefSuperS]

Typical only 2 nuts and they are burred to the point of getting no purchase socket spanner and ring spanner no good what to ever was thinking for ease hoping to remove system from cat back and hack saw the blitters off as i cant get decent access or leverage with axle stands ( thats if the cat bolts are able to be removed ) !!! Or is a drill and decent metal drill bit best way to go ? Simply need it off and get the nismo on again all pointers much appreciated ! (ps were soaked in wd40 etc but no good)

 

[pork]

Can you fit a small set of these on the nuts?

 

[frank]

some of the backbox nuts are captive/welded on iirc, and 2nd cat nuts are usually badly rusted eh, i usually use a grinder if they,re really bad

 

[SefSuperS]

Yep they look captive typical as the Super S werent nice easy job it was looks like ill be cursing the cat bolts and getting some new discs for the angle grinder