Originally Posted by bostonceltics
is it really loud?
i have all sorts of combos on different cars....when i did a 40 series on my jeep grand cherokee limited with 4.7 v8 and kept the stock resonator....it was a bit louder than stock, real low rumble.
I then decided to cut off that resonator with the 40 series.....TOO LOUD...sounded like a dump truck.
i say just doing the muffler swap, the 5.4's probably sound really nice with the 40 series muffler. I am sure there are plenty of people on here with more experience with this muffler on the F150's that will chime in.