As for the y pipe that is most likely the most difficult task the turbo is easy to clean and for the y pipe you will want to get new bolts and nuts...if the veins are sticking the turbo will not be able to move the unison ring which will cause the size of the turbo to be larger or smaller..as for the egr delete I have never done one but it is likely that the egr is carboned up also which is also a very common problem on 6.0s and will cause a lack of power black smoke concern and the truck will not be able to get out of its own way...it may fight you some but you will just need to take your time if you are going to tackle this... 6.0s run great when they do but the same goes when theres something wrong...most of the newer updates have the parameters so far that most of the time the cel will never set even if there are codes present...the turbo is pretty easy to do also once it is on the bench if you need help I can give you step by step directions...the trucks are great but when they break sometimes theres more then one concern and can get costly...ford warranty is 5 yrs 100miles...if you need any help feel free and welcome to the site.