There is lots of exaust talk, but i couldnt seem to find much information in just a muffler replacment. I am looking at the two exhausts, magnaflow or aeroturbine. What are the sound difference, there are a few sizes in the magnaflow. i am looking for a deep diesel sound, that will tell people that yes it is a cummins but something that will tell the cops no i dont want a ticket or the attention. i was thinking something like the 24 or 30" magnaflow vs the 4040 aer turbine. anybody with these have any comments? also how much was it to get installed or did you do it yourself? thinking about keeping the cat on at first and if i need more sounds remove it afterwards.