JTP,
I also recommend SSI Performance located in Parkville, MD. The owner, Sloan Palitti, has fixed my cars for the past 10 years. His staff really know their stuff and they are very honest.
Gennady at GT Performance is a good guy as well. But with SSI in my near vicinity I cannot justify the 30-40 minute drive to Edgewood, MD.
See:
http://ssiauto.com/
Cheers,
Humberto
2001 Boxster, Mulsanne Bumper, Gemballa Intakes, Gemballa/Speedline 18" wheels, PSE
1986 944 Race Car
1998 BMW 318ti