Lets stop the personal attacks.... I think you will find the typical golf may not have a true exhaust manifold, I will need to take a look at ours, but even if there is a exhaust port for each cylinder, you would need some custom parts for a true dual exhaust. If you do a Google search for golf cart parts, there at least a dozen sites that have LOTS of parts. I would start there and see if the dual exhaust is an option for your cart. This will give the cost of the parts, then you would need to add it the installations costs if you are not going to do this yourself.
PS our cart has "dual" exhaust, one real, one fake, previous owner added the second one for looks. Will be glad to share photos of what he did.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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