I'm have a Jardine system on my 2.7. sounds a little ricey. Borla, Magnaflow, Gibson, Downey, LC engineering. If others don't have a cat back kit, you can always buy their muffler and have a shop custom install. It all depends if you want ca smog legal or sound. And of course price range. What I've read, most are running magnaflow or flow master. TRD doesn't make for 4 cylinder.