I've just settled on a turbo kit! I was looking in to an all motor rebuild but after many discussions I'm not sure I would hit my goal. So I settled on a turbo. Have just ordered one from Big CC Racing with dual boost controller for approximately 220 / 260HP. I plan to do the install myself and then take it in for a proper dyno tune. The one thing I'm not sure of is the exhaust. I've just gone with dump pipes to start but would like to keep the bike streetable and not obnoxiously loud. I've got a full M4 system on at the moment that I thought I could mod / reuse but I've been informed I need at least a 2.5" internal bore to be unrestricted and mine is 2.25". Thoughts?