get the smarty, good intake, get rid of cat and stock muffler and get good performance muffler.

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the 07 has a 4" system already on it and unless you are planning on building some real big power 5" exhaust is a waste of money.

 

Id stick with the Edge. Guages are important. Easier to change tunes. Better for towing. You can get a full TRUE 4inch exhaust for around 300 bucks. That means you dont have to cut and splice your stock system and you will have alot better sounding truck.