[align=right]Post #2[/size]3[/align]hey there.....i bought my 04.5 2500 4x4 ctd with a 4 inch flowmaster american thunder exhaust system allready installed. Since it is my 1st diesel im not sure how the flowmaster system compares to others. It sounds ok to me but I really like what im reading about the MBRP. I like the middle of the road XP series system. Can anybody give me some opinions on the systems. I know flowmaster primarily deals with gas exhausts and my truck is the only truck I know of with the flowmaster diesel system. I would like a little more noise. I dont want to straight pipe it and cant lose the cat because of emission issues. I allready have a edge juice/attitude and volant cai installed if that matters any. Thanks![/align]