Review on Flowmaster 817511 Axle Back System 409S by Adam Cooper

I fitted these to my 2010 Mustang GT Convertible and they are a lot better than the factory mufflers. Installation only took 2-3 hours and I didn't even bother putting the car on the ramp. The hardest part was removing the stock mufflers. Once that was done the actual installation of the Outlaws was much easier as they are smaller than the stock mufflers giving you more room to work. Sure, these things are loud, but they're not overwhelming or obnoxious. I tried to get a set of American Thunder, but I was afraid that they are not much different from the factory mufflers. I'm very glad I went with the Outlaws. They sound great, the drone is very small. Guaranteed to put a smile on your face when you start the engine.