Hey George, 
Unequivocally I would recommend Matt De Maria at Stuttgart Performance Engineering, the job is done right the first time. He is located in "Old Town" Gaithersburg, and one of the best techs in the area bar-none. 
http://www.stuttgartperformanceengineering.com/ , 301-948-6762
I know in your post that you said that you wanted to track the 2000 996, are you sure that you want to track that particular car though? 
I have the exact same car, and due to reliability issues that the engine suffers I would do some research before I would track it "personally". If you do track it, rock on!!
		
				__________________
				“When I was born I was so ugly the doctor slapped my mother.” – Rodney Dangerfield
Bill C "aka" Catdaddy - The Catfather - 
Current:
1980 911sc
2019 Ford Raptor 

1987 Mercedes 560sl
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Sold:
2011 BMW M3
2000 996 C2-IMS 2 Row, RMS Update
1986.5 928s
1987 944 16v
1973 911t
1969 911t "My first car"!!
1969 Westfalia Bus
1973 Volks Superbeetle