Can't tell you how many times I had the stock and 65mm t/b on and off and on again and re-used the gasket over and over. You just got to be careful not to tear it.
The screws into the plastic manifold, always a concern. Cross thread them more than once, or go to tight and crack the stock t/b mount and your screwed.
IntakesAndExhaust.com / myFordPerformance.com