IOM,
It is bolt-on. It just is easier on an MC21 which is what was used as the test bed. I beleive mine was the first 18 so now there are 2?
Jetting is very specific to temp, altitude and humidity. As such it is immpossible to test the kit in all permutations.
I was very unlucky that my "donor" bike had a faulty TPS otherwise I probably wouldn't even be writting this.
Stephen you didn't tell anyone that you had to file out the bottom fairing to accomodate the now centrally located plug lead.
As for the power. Remeber the kit may and probably is running standard road port timing etc. I don't know if Tyga has done a "ported" and polished version and even then the pipes play a big role in the eventual power outpput. My bike goes well off the clock flat out. Somewhere near the manufacturers logo!!
Mike