Thanks Chris, that's interesting info. I really expected the Jetta to be better than the Golf. Oh well. I wonder if the Jetta GLI 16V rear spoiler would help?

On the issue of the Scirocco 16V urethane/foam stuff, I've heard that it was more for looks than anything else. Someone knowledgeable told me that he thought it would increase drag over the cleaner 8V trim. Either way, it's hard to say what happens in IT trim with the windows down, etc.
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I agree, I thought the Jetta might be better. I do expect the GLI wing would help separation at the trunk and make a bit of difference. I also expect the 16v Scirocco airdam would help. The 16v rear wing looks like it would help separation more than the little 8v wing, but then again the Porshce 928 looks like it should be more aerodynamic going forward than backwards, which in 1978 was not true...