The Classic Duals have all the same high quality features as our originals. But, by replacing the billet end caps with a new steel baffle-end cap combination, we've been able to lower the suggested retail price on most models. CLASSICS offer the same powerful design, superb fit and finish. and a classic sound you'ld bet was straight out of Milwaukee. Classics come standard with full length, full coverage heat shields. The heat shields cover any head pipe bluing or discoloration that may occur from heat. That means new looking, show quality pipes for many years to come.