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Gear ratio or Grp A header



hi
i read in the recent roundel in the classifieds
I am not sure how much i will gain in this :
4.45 ring and pinion for $450 for the E30 M3
Will this make a huge difference?
Or, i can get the Group A Header - ceramic coated for $650
which will be the better one?
thanks


Franklin
89 M3

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