the 1.6 in our car is identical (without having them side by side to compare interchange parts) to the new version of the vauxhall z16xep which is rated at 105 hp.. There is also a z16xer which is rated at 115, but i cannot find differences mechanically between the two.. other than mention of possible porting differences in the head, and ecu programming.
both these engine have tuning options, included chip flashing, turbo swaps, headers, cams, pistons, etc..
they are kind of pricey but they are out there. Another thing i have noted, is the z16let turbo manifold seems to bolt to both of the engines mentioned previously. using a head spacer to equalize compression to the z16let it seems we could bolt on its turbo accessories, and plug it its computer for @ 200 hp.
there is also a z18xep that seems it is our engine with 1.8l displacement, and more hp.. it seems to use the same block (heads are interchangeable?) but different bore or stroke..
just giving you guys a start to add to the thread if you desire, confirm or add to what i have.. it might be a base for en ecotec build.