If it sounds good on my 3.0 with just a MAC Performance intake then it will really sound good on a 4.0! It dosnt pop on mine or anything, not even reving at the redline. It has a true gurgle sound to it. If I were to describe it furthur, it allows the true muscle sound of your engine come out without the crackles. Its the perfect muffler.
__________________ 2003 Ford Ranger Edge 3.0L Vulcan Auto Tranny
MAC Performance Ram Air Intake
Flowmaster Super 44 w/ tailpipe before the wheel
Interior and Exterior LED w/ music interface
Ford Racing front and rear Sway Bars
Limited Slip with 4.10 gears