I’m putting Nitrous on my 2005 VRSCSE 1250 . I had a 09 “F” years ago that had nitrous but I can’t remember what max hp the factory injectors / fuel pump was rated for . Obviously I don’t want to get to my Max duty cycles . Have it in a nice comfortable range
otherwise my 2nd option is to knock a hole in the fuel tank and plug a small pump to do a true wet . I have a billet spacer to drill- tap - plumb 1 Nozzle for each cylinder . I think 20X-2 (40 hp) total shot would be maximum as I would go .