Just read the myst mod for the tour and the mil. Will these mods cause any of the other system to barf a cel need to know will down this on sat if it don't will also do the y pipe mod. P.s i have 85642k on my tour take it to ford before my warranty was up they said that cat aren't cover but i find out that thats big B S so to all ceg'er is this mod cool it sound like it is the best bing for the buck thank need to get more cer'er up this way for a meet i would love to go to the sprig zing once again . thank to all that repal CB from NY