MBRP Aluminized Cat-Back Off-Road Exhaust System 07-14 FJ Cruiser
[S5310AL]

Easy to install, if you have a tow hitch the last piece of exhaust will not fit. Did increase my gas mileage a bit, although I did not like the sound of it during acceleration, maybe cause of the last piece is not installed. I should have spent the extra bucks and purchased the TRD system instead.