[Gary WA]

If its leaking around the clamp or manifold gasket you will see black after driving ' That is your leak. Never had a leak by taking aluminum foil fold about 4 layers to about 3/4" wide, once muffler and manifold are lined up by using jack wrap foil around the two surfaces and install clamp keeping foil aligned.Tighten clamp, rear too. No need for gaskets pipe dope etc.