Im looking for a good mufflers for my 6.0 build ,right now Ive got 40 series Flowmasters and they are way to noisey with the engine stock and Im changing cam,and putting some 243 heads milled .030 so compression is going to be in the high 10s to 11 to 1 so I know that the flowmasters are going to be even worse .trying to keep the sound down without killing the Power .Any suggestions?