For performance I don't think anything can beat the MRT! The JBA/Magnflow/Borla are all basically the same design. MRT uses the Aero Turbine Muffler which is a completely different design (
www.aero-turbine.com) I had my doubts about the performance claim that Aero Turbine makes... however my butt dyno said the gains were there so i PAID FOR A DYNO SESSION out of my OWN pocket to verify the gains... The dyno show the gains were there! The MRT made 7RWHP more than a Magnflow at peak HP... more impressively the MRT made like 10 to 12 more RWHP at like 5500+ RPM! Goes to show that the muffler really works as claimed! Remember these gains are OVER a high peroformance Magnaflow, not the stock muffler!!!
To get an idea of how the MRT sounds take a look at this Video: