Brass Balls Cycles use these ribbed tips on many of their custom projects and decided to market them, targeting individuals and small shops who don’t have access to machinery to make their owns.
They are a simple bolt-on on all 1-3/4″ O.D. exhaust pipes. Machined from aircraft grade 6061T6 billet aluminum. Sold in sets of 2. $84.95 per pair, including set screws for mounting. At Brass Balls Cycles Online Store or your local dealer.