Graham
i'd say wait for now before buying a pipe as there are new EFRA specs for next year! pretty much ALL the pipes in use at the moment will be illegal according to the construction specs submitted to the pipe manufacturers!
have a look on the pdf
http://www.efra.se/news/download/200...ept-2007V2.pdf
as far as i know the BRCA will give us a years grace on using the new pipes like they did when the 3 chamber ruling came into effect in 2005
it really depends on where you plan on racing really?
club racing - you can get away with pretty much anything
BRCA Nationals - prob use existing 3 chamber pipes in 2008 but have to use new ones the year after (need official confirmation on this)
EFRA sanctioned events - you'll need a new pipe made to the new specs!
nothing published from last weekends EFRA AGM yet?
as for engines the Go are spot on for the money, a few quid more will get you a Novarossi Sirio or RB! any of those would be a good choice