IMO...It's a big mistake to talk strictly about exhaust. It not only depends on what cylinder, cam, head combo you're running now...but in the future. For guys who plan to stick with an air cleaner, PC or RT and pipes, the Rineharts are not a good choice. Find a good two into one!!!
Personally, for me, NOTHING!!!! makes more power on the dyno than Freedom Cycle modified Rineharts, ( different baffles ). That's only because we have tested, the Pro Pipe, Thunderheader, Bassani Power Curves and Screamin Eagle pipes with my motor. I also like the look of duals and prior to the Rineharts there weren't many good looking duals that made much power.
Do yourselves a favor and find a good dyno tuner and Experiment before you buy if you can. I repeat, if you can. [smiley=huepfenjump3.gif]