Pep Boys carries the clamp but none of them carried the 2" size in my area. I tried Autozone and a couple other auto parts stores but no one carried these. I really like them because they make a nice seal. As you tighten it, the band forms to pipes.
To resurrect an old thread, do you need 4 of these clamps if you are installing secondary cat delete pipes? 2 for each pipe, 1 clamp at each end of the pipe?