I also cut the wheel well out of my Duster because as many people know, you can't get 3" exhaust pipes between the stock gas tank and the rails. The solution was to put in a flat piece of grooved metal and install a 1968 Charger gas tank. This tank also has the fill inlet in the same spot but is much narrower and longer front to rear. It barely fits, but once she's in there, the average person won't know the difference- and the pipes will clear no problem. Add your vinyl trunk mat, and she's done.