Recently bought a used Jeep Wrangler which came with a secondary exhaust and resonator removed. It was very noisy, as you might imagine, like an exhaust leak. Decided to use this Magnaflow to muffle the sound, which it certainly did. But to my great surprise, I wasn't expecting an increase in performance. Finally things are working as they should. And now my exhaust has a nice rumble, that was probably intentional. I asked a local Meineke to weld it for $80 which only took 10 minutes. to complete, worth the cost.