Originally Posted by jwsmitty1989
A catback unit from flowmaster or magna flow will give you the results you seek, also if they aren't loud enough (which a flow master can rattle windows) then you could always get a shotgun header... or depending on the state cut the muffler down, flowmaster actually will increase your power, magnaflow says they do but they are mainly for show.
How is flowmaster going to increase power but magnaflow wont? Magnaflow is a straight through design allowing for increased airflow therefore better power. Flowmaster on the other hand is chambered so its pretty much a sound mod. Yes, flowmaster will flow better than stock but its still not a magnaflow. Either way neither is going to make a huge difference in power.
I think ARH makes longtube headers for the 2500 4th gen but I'm not 100% sure about that. Also, in general, flowmaster mufflers are louder but more raspy and magnaflows are quiter but more deeper rumble. This will all come down to the setup you have for it all as well.