If you are getting that kind of milage I wouldn't change anything, LOL
The duals actually add a little rumble, even though I have the stock muffler on one side and a ordinary after market muffler on the other (nothing hi-flow).
According to Ford it adds 15 HP, 224 to 239. Lets face it you are really not going to be able to "notice" that....it just "seems" better......
I just didn't want it to look like grandma's car, so I like the twin plumes of vapor coming out the back on a cold morninig......
Next is a black Marauder Grill for the front, instead of that grandma plastic chrome.....
