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What I mean is you'll not get a big performance gain altering the throttle body in general, rather than you'll do better fitting X or Y.
Not that many people mod the 1.6 version (usually modders pick the 1.4 or the 1.8). But breathing mods will help, both inlet and exhaust, just don't expect a large performance increase as the engines are fairly highly tuned to start with (particularly the 1.4's).
Dave Andrews is a bit of a Guru with the K series so if you see advice from him on the net it is usually very good.