I have the same combo on my 04. Is the pipe ceramic coated or painted? If it is painted you have to wrap it with header wrap from the Y to at least the 2nd bend. The painted pipe won't make heat. It is to thin. The ceramic pipe does better from what I have heard, but I would still wrap it. It is a hard thing to determine, but watch your rpm. Before I wrapped the pipe I could watch my RPM increase over a long pull up a hill, and it was from the pipe getting hot and working correctly. In a nice warm shop where they are tested they work great, but put them on a sled at 10 deg and snow blowing on them and they won't heat up unless you have the throttle pinned for a considerable amount of time. Then they will out perform a stock pipe, but you have to get the pipe hot.