It depends on the year I think. I may be completely wrong here but I think the Mk1 F 120 1.8 mpi had a smaller mass airflow meter, a plastic inket manifold and a slightly restictive airfilter box. A popular upgrade at the time was to replace them with uprated items from the VVC. Later the same were standard on the 135 so became even easier to source (though it's plain metal manifold was rather less bling than the VVC's)

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