you may need to fit a reducer at some point if your swapping it over to yours, but theres lots of mk2's with mk3 backboxes on without any reducer at all.. mine incuded.
(although I DID need a reducer on my old 1.4 when i fitted a mk3 Cupra backbox to it, just inverted the reducer )
depends what part(s) of the exhaust your going to use, i guess.. ive only ever used the bax box's before and as I said, on my Mk2 8v I didnt need to reduce or owt as it fitted straight on .
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