Has anyone self installed a set of long tubes on their S550? Since I'm on vacation now until March 4th, I thought I would try to tackle the job myself. I just dropped over 1100 at LMR for a set of Stainless Power long tubes, they will be here by Monday. Also, does anyone know for sure if the exhaust port threads are 10mm x 1.5 or 10mm x 1.25? According to my research, the coyote engines started out in 2011 with the 1.25 threads and some time in the 11 production run ford switched to the 1.5 thread and all coyotes have had the 1.5 ever since. I want to make sure before I drive down to Summit racing and by the Stage 8 locking header bolts, they have both sizes in stock and the are the same price. I just want to get the right ones the first time.