My first post. I have a 14 Silverado with a 5.3L 8 and want to put true duals under it. Seems like all I can find are Catback systems with 2 into 1 into 2 and that's it. Does anyone know of an aftermarket dual exhaust that is available for this vehicle? If so, do I need to be concerned with O2 sensor problems (backpressure), etc.. Am I asking for trouble? Thanks in advance.