I packed the gate with insulation and still couldn't hear on my cell phone when climbing a hill. I took it back today and had two 12" resonators installed (one on each pipe,behind the muffler). It really has quieted the interior sound to a point where you don't notice it. It still sound good outside though. I've driven it about 300 miles since it was originally installed last week and there is definetly an increase in performance and gas mileage. We'll see if that changes with the new set-up. Still would recommend it for the price but include the resonators if you want to hear yourself think inside or spend alot of time on the phone.
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