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Our exhaust system for the AM15 is complete, it has been for some time, just now getting around to posting.
We utilized all exhaust parts from the firewall forward kit, with the exception of the ball joint. We could not fit the ball joint in anywhere in the mix, either between the header and and muffler, or between the 90 degree bends. Any way you sliced it, there were clearance problems either with the radiator, or the bottom of the cowl or the firewall. So, we left it out. We created supports for the front and the back of the muffler from 1/4" stainless rod and 1/8" stainless plate. This offers great support for the exhaust system. We will hope for the best from this configuration. See attached photos.