I just checked the gasket on the XTM engine to the one that is from my HPI S-25. The one from HPI is thicker. This made a much more snig fit on the exhast manifold. I am using all my old HPI Savage 25 LE exhaust system - HPI Tuned Polished Pipe, header and couplers. I would assume that is why the XTM gasket was not fitting properly? I will have to stop at my local hobby shop and pick up a 17t bell and try that.

Also, I was thinking of changing the exhast system. I was looking at the Jammin Pipes JP-2 setup. How much of a difference will this be over the stock Savae 25 LE exhaust system? Does ALL the mounting hardware/gaskets/spring/set screws/manifold come with the pipe? If not what other items will I need? I like how the pipe is connected to the manifold. No more of that purple silicone coupler. Thanks again for all the help!!!