I figured I would make a post of this here as this is where it belongs.

http://autospeed.com/cms/article.html?&A=0629

the good part starts in part 3
http://autospeed.com/cms/article.html?&A=0646

in part 5 he has actual test data on how well ram air works. (he dropped his losses by .25 psi)
http://autospeed.com/cms/article.html?&A=0663

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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png