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Tunning the 1.8 engine isn't as efficient as the 2.0 bottom end you'll always be chasing power which is easy to get on a 2.0 bottom end.
Why not get a whole second engine drop it in and when you come to sell them swop back.
There a lot you can do throttle bodies head work cams but even with all that a normal 2.0 with cams would be just as quick and easier to drive with more low end power.