You are probably better off extending to the side rather than the back to avoid the backdraft that the carts create, especially with club bags strapped on or the curtains down. Also you should be sure that the extension pipe is connected with a flexible coupler. The engine flexes on its rubber mounts and without the flex the exhaust system welds will eventually crack or break.
A couple of years ago The Villages Cart store welded the extinsions onto the factory pipe and bolted the extensions to the frame and the weld problems showed up. When I last looked (late summer) they were using a rubber-like tube for the connection. (I assume it was not rubber for a hot exhaust system!).
As for additional back pressure, I do not think that is much of a problem because the extension is added after the muffler and there is no additional restriction of exhaust flow. A 12 inch-long pipe of the same diameter should present the same outflow pattern.
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All of us could take a lesson from the weather. It pays no attention to criticism.
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