It could also be a shortened, modified muffler from www.vtxexhaust.com.It's amazing they found one at a bike wreckers. Imo the pipe looks stock to me. It looks about the same length as a stock 1800c pipe with a stock tip. The extra sound may come from an altered baffle. Nice bike! I love the paint scheme
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Here's the 1800C stock length (goes past the rear wheel).