Should be a pretty easy fabrication to make it work on a 4.8is. you will proably need to cut off old mufflers that attach to the center resonator and use the mounting flangs with pipe to connet to the Dinan 4.4 mufflers. I cane across a killer deal on a set of new Eisenman race exhaust for a 4.4 and i purchased them and had a muffler shop cut off a section of the pipe that mounts to the center resonator and connect them to Eisenman and then hook them up to my 4.6is X5.