if you don`t know about hq it is trial and error. most people on here heard about or rode someones bike that had work done by a particular builder.or got their ass handed to them in a race. duncan was a big name back in the day. now there are hundreds of capable builders. on hq at the moment it is FAST AND PASSION. it just so happened i had a banshee from each builder in my garage.a brand new motor from passion was on the 1 bike. 12 port 4 mm.the thing was a beast. very nice package. with duncan you are paying for the name, duncan, paul turner ect. same motor work different builder. thousands less.on hq your questions about a set up can be answered quickly. all you gotta do is ask.