If this is the kind of thing you are looking for:
you will find more interested parties at honda enthusiast sites...but...there are some body modifications available to those with deep pockets...let me start with what is not available...
The "shogun" style front end or any derivative there of.
Huge, useless, heavy spoilers.
Wheels larger than 18 inches (there are some 19's available for 911's, but I think they lack taste and are more for the drug dealer type...all though they may fit)
Strange looking multi-angled side skirts.
Yellow stickers (well...maybe those are available...I don't know)
What is available...try...
Better bodies
infinite fiberworks
Some weird german people
Icy Hot Stuntaz (sorry...had to do it)
GT racing (one of my favorites)
Kokeln (they make a more agressive front end and some other stuff)
Just came across this one by accident
And some company called AIR that makes front splitters and other stuff...just I can't remember their URL.
Hope this helps...
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ribs, 86' 951