I've used stainless band clamps for various exhaust projects since the '90s. Highly recommended, as long as a person understands that they are not always re-usable. I can re-use them about 75% of the time, once. By the second or third re-use, they're scrap. Be sure to buy the correct style--there's the butt-joint kind, that are the same diameter from front to back. There is also the lap-joint style, that is slightly bigger on one end.
Beware that there are NON-stainless band clamps; they can and do rot. I found that out the hard way.
Beware that there are NON-stainless band clamps; they can and do rot. I found that out the hard way.