there are a few ways to go about a 1.9 conversion, i bought a 1.9 bottom end from specialised engines to do mine, everything from the 1.6 bolts straight on . from what i can gather though alot of people dont rate the specialised engines bottom end very highly but i have had mine for a few years now and cant fault it, obviousely (sp) with more cc the fueling will need setting up by somebody that knows what they are doing i think also a turbo with a .48 exhaust housing is adviseable but could be wrong? apart from that... nout to it