Speedsters for V-Twin. PowerPort crossover makes for a significant power increase from just off idle to redline. PowerPort increases power and overall performance by providing superior scavenging of exhaust gases over most standard exhaust systems; similar to what you might expect from a 2-into-1 system.
Love these pipes. I got black for my blacked out Sportster. I really like that you can EASILY remove the baffles when you want to be obnoxious loud. Highly recommend.