If our breakdown didn't help you out much, then you can check your driver's door information sticker to find out your wheelbase, which is listed under "WB" beneath the bar code and paint color code. Check the image below for an example.
The first cat-back we tested was the aFe Mach Force XP 3" Stainless Steel kit. The guys over at Extreme got aFe's kit installed with some fairly minor cutting, and off we went with our cameras to a nearby road. aFe's kit falls squarely in the "good" category when it comes to aftermarket exhaust kits. Not too aggressive, not too loud, not too raspy. It's the perfect kit for anyone who wants a little more roar without a huge increase in sound. In-cabin sound is noticeable when you step on the throttle, with only the slightest hint that there's an aftermarket exhaust kit on the truck at cruising and idle. Anyway, check out our clip below.
Up next is the Solo Performance M400 4" Cat-Back Exhaust Kit. This F150 5.0L kit was much easier to install, due to the fact Solo provides separate kits for both 145" wheelbases and 157" wheelbases that let the systems bolt right up to your truck without cutting (unless you have any other wheelbase size). The MR400 has a few features that allow you to adjust the sound of your F150 exhaust system to some degree. The most noticeable of which is the kit's unique J-Pipe design that helps cancel out drone and rasp, but can also be removed for a more aggressive sound. Secondly, the muffler is reversible allowing you to face its perforation toward or away from your exhaust flow for a quieter or louder tone. We configure kit for the quietest sound for our testing, and even then, the MR400 system was deeper, louder, and more aggressive aFe's Mach Force XP System. Check out the video below.