Playing with my exhaust and need to know the diameter of the stock exhaust pipes. My current setup is basically a rear muffler delete with quad tips. Sounds great around town, but on the highway cruising between 70-80 it is killing my brain the drone is so bad. I'm looking to replace one of the silencers or resonators in the middle with a dual in/out muffler. If anyone else has a similar setup I am open to suggestions.