I have a 2010 DC with the 5.7 and want to change out my stock muffler with a Flowmaster. I'm stuck on the original 40 series but it seems that this muffler does not come in the stock Tundra configuration. What would need to be done to swap out the stocker for the original 40 series? Has anyone done this? I just think I'm going to be disappointed if I go with the 50 series. Thanks for the help.