Hey Mate

The Hyper ST is all metric thank goodness.

As for engines, get yourself a good 28 or even a good 21. Not sure of prices on that side of the pond, but an LRP 30 might be a good bet or even a Nosram 30. I belive they are pretty much the same engine. The previous LRP 28 was a belter for the money.

JP-2 is a good pipe, the JP-3 produces the most power of the JP pipes, but the best overall is the JP-4, more power than the 2 and much better economy than the 3.