I have the factory breather/oil interceptor and oil system upgrade kits to fit to my 2014 Sport. So far have fitted the non return valve (line to the oil cooler), filter (line to oil pump) and the gauze screen in the scavenge from the sump. Next was to be the sleeve and spring/ball non return (?) thingy in the oil pump but the instructions note that the breather mods should be finished first. Anyone know whether there is a technical reason for this or is it just a convenience thing? I haven't yet decided how much of the factory breather/oil interceptor stuff i will fit, hence the question.