Ideally a PPP or something like one, after replacing 'too' loud one it came with.
Also after
Stack oil pressure gauge
Decent tailgate
Std air box
Not that I have these parts to spare, but there is some tailgates on ebay.
http://www.ebay.co.uk/itm/VW-Polo-MK2F-Coupe-1990-1994-Tailgate-Various-Colours-/130990128305?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Model%3APolo&hash=item1e7f9ebcb1
Thanks Jester, saw these but thought a long way if collection only, we are in Devon! But checked them out again and look ideal so will encourage him to post. Cheers James