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i know that the gti6 exhaust manifold can be fitted to the 2.0 16v to gain alot of power, i was just wondering if the inlet manifold would fit and if there would be any gain in power from doing so

Yes it will fit, Not sure what the sensors are like on the 1.8 but I've changed the sensors to the GTi6 inlet from a 306 S16 I have, Had to make a couple of plates as it uses a external idle Valve against the 6's stepper motor idle valve and new throttle cable and that's it, The throttle body is a good 15mm larger so you should notice a differance

No, it wont be compatible. The S16 uses the same fuel rail as the GTi6 so its mostly ok. The 2.0 uses totally different managment and a different fuel rail.
However the exhaust manifold if something you should look into, its a straight swap over and its a 4 branch tubular 4-2-1 so you will see 10+bhp and much more responsivness. You will need a GTi6 (or 205 1.9 GTi) cat though as the 2.0 isnt the same.

The GTi6 and S16 use different fuel rails and managment, So some careful sensor positioning will do the trick no problems at all. I'll eat my hate if it doesn't fit