I sat down with the service manager at the Glendale HD shop when I took my bike in right after putting the pipes on. He pulled over a couple of other guys and we all talked about the whole rejet thing. According to them, you only need to rejet when you put on a high flow air cleaner. I felt a little silly becuase I didn't know that, but they were patient with me and walked me through all the whys that go along with it. I was happy to see that they saved me all that cash and didn't try to take advantage of me.