I would like to increase the power a bit on my stock 2000 WR400. At 110kg in my socks (God only knows how much when kitted up), I am starting to trail behind others on some lesser bikes!! I want some more low and mid range range power, but am overwhelmed by the volume of suggestions on jetting. For a first attempt, should I jet or should I go for a power exhaust (bearing in mind that trail riding and Enduro sound restictions in the UK). Can anyone give me a shopping list of jets and needles to try? and does anyone in the UK have any second hand parts (exhaust included?). Thanks all.