manifold will fit no probs, but be warned that there are .5mm holes in hte base of the intake for lubrication of the intake valve seats on the diesel which you dont get on the petrol, so by some miraculous act you might cause yourself a problem one day. i very much doubt it.
anything you can do to give it more air will help. i dunno about the electric supercharger...no experience...
a decent exhaust helps (but is loud on mk1 diesel, no turbo to quiet it down) 2" is good size.
but yeah, lots of air will do a world of good.
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