I have a 2005 GT with stock manifolds and JBA mufflers. Yesterday I installed Bassani off road x pipes now the car has a very loud popping sound like machinegun fire, exhaust note at 2500 - 3000 rpm. I would like any feed back on why this system sounds like a burnt out nova I would install the Bassani cats but the ones they sent me are lackin the senor bungs. Hate to switch it all back to the stock h pipe but the sound really sucks. Could this be a leak in the back mufflers.