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Re: New Magnaflow Shorties w Cats
It looks like you have some side-access to the rusted nuts. The worst thing you could do would be to break off a stud in the head; that would likely require you to pull the head to EDM the stud out to avoid any possible damage to the head.
After soaking with multiple applications of penetrating oil for a week, apply a conservative amount of torque and see if the nuts will will break loose.
If not, use a length of 3/8" or 1/2" steel rod and a ball-pein hammer and sharply rap on the sides of the nuts 10-15 times, then try the conservative torque again.
Sometimes the nuts will stay locked on the stud and the stud will unscrew from the head. If you can easily get the studs out, replace them all with new parts. There is nothing more frustrating than installing new exhaust plumbing, carefully torquing everything, and having an old stud break two weeks later.
If it appears that the nuts are effectively "welded" to the studs via extensive corrosion, use a nut-splitter to split the nut, and you can unscrew it with your fingers. You can use a socket & long extension to apply the torque to the splitter.
Torching the nut off usually takes the stud with it, and then removing the remaining stud can become the next challenge.
Given the level of corrosion shown in your photos, that engine bay has seen its share of road salt, and I'd be very careful of damaging the studs.
Last edited by FJtest; 08-07-2018 at 12:25 PM.