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Ah almost another Mk2ey! I drive an '87 Jetta, 1600 carburettor.
I was just about to suggest the Mk3 (reading though all 6 pages) when you did yourself. I do remember it being more aerodynamically CdA-wise and that the Mk2 actually = the Mk4 in CdA values, but couldn't find the data.
Just for interest sake, I do also remember reading that the Mk2 bigbumper was in fact more aerodynamic than the smallbumper.
I guess you're stuck on the Golf, but technically sedans are usually more aerodynamic than their hatchback variants. Plus, I'll never trade the tonnes of bootspace for a hatch, but it's just personal choice.
I am not familiar with the Mk3 underside, but I do suspect some similarities. I'll be keen to see what you come up with. Shaven front definitely a plus aero wise and it just looks better. Back bumpers might scoop air, but if you plan a rear undertray, that won't matter. I saw on my Mk2 that the rear muffler could be raised closer to the body somewhat and I am sure you could get a clean rear undertray with the Mk3 with just the diesel downward style exhaust end poking a hole through there.
As far as the mirrors go, you might want to consider the Mk3 (Mk3.5?) Cabriolet mirror for the driver's side. It's a neater looking unit and possibly more aero than the orig Mk3 units. It'll go well with the shaven front.
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