One of the hard jobs to do by yourself is to put an exhaust system on a plane by yourself. It is tough to align the exhaust system with the studs and get all the exhaust no-blow gaskets on all at the same time. You can use cotter pins to hold the no-blows on the studs, then pull them off later.

Others use some high-temp RTV (the orange stuff) to act as a tack to hold the no-blow on the exhaust face while the exhaust goes up. First, RTV is an insulator so heat from the exhaust area does not transfer efficiently to the exhaust SS. Second, even if you get a perfect thickness layer of RTV, it will eventually burn through in a small area. This make a small jet for the hot, burning and corrosive exhaust gas to escape. Most of the time it leaks by the exhaust stud that holds the exhaust up. This will wear away at the shaft of the stud and maybe even weld the exhaust nut to the stud. This is not so bad as when you remove it, the nut and the stud come out as a welded unit.

Worst case is, the stud break and the cylinder has to come off and go to the shop. Expensive fix. Lastly, it will try and weld to the cylinder and take heat and lots of turning force (vice grips) to remove. I had one on a Tiger that took 3 hours, a bottle of MAP gas and a helper to remove.

Here are an example of each. The one without the nut is the one from the Tiger. This is why every exhaust system should be removed each year as called out in the Annual/100 Hour checklist.