I have rush slip ons on my 07 deluxe and have had no remapping done. I spoke to the Rush dealer and he said that no other engine mods had to be done unless I used the large pipes at high alittudes. I live in Penna and have 23000 miles on my bike without problems adn the plugs are fine. I do have occasional decel popping but that is due to a slight air leak that I can't seal with the pipe clamps. don't waste your money