I am looking to add some sort of sealer to the end of the stock exhaust manifold and a MAC Prochamber mid pipe. I was curious to see what you people would reccomend. I have muffler sealer somewhere, and i know that worked well on a muffler. But I dont remember the heat limit on it. If you had to use some sort of sealer that could stand up to extreme exhaust heat, what type of sealer would you use?