Not sure if it'll work on an 883L, but I put mini apes on my 1200L without changing any cables. I just did some rerouting and I had to bend the front brake line.
i had to lengthen the brake line on my 05 883L but everything else was fine....how'd you find the re jet and air cleaner....i have the se slip ons now and looking to do some more...was thinking the s&s air cleaner
I didn't need to replace any lines when I first put the mini's on. But of course needed to replace them all when I did the frame chop. But stock, yes, you can get away with using all the existing cables.