Probably not what your wanting to hear but best bang for you buck will be an engine change to a GTI6 engine
But then you may as well swap cars, not much you can do to the 1.4 and not much point in throwing loads of money into it IMO
Probably cost you quite a bit to insure all the mods your thinking of anyway, may as well just stump up the cash and trade in and buy a 1.6/1.8/2.0 really, don't think a 1.6 would be that much more to insure than the 1.4.
But then you may as well swap cars, not much you can do to the 1.4 and not much point in throwing loads of money into it IMO
Probably cost you quite a bit to insure all the mods your thinking of anyway, may as well just stump up the cash and trade in and buy a 1.6/1.8/2.0 really, don't think a 1.6 would be that much more to insure than the 1.4.