Kevin Helms (Honda Challenge Racer) owns a shop in Charlotte called Hondaworks. I don't know if they work on Miata's, but from my experience, Miata's are not that much different from Civics. Its worth a try.

http://hondaworks.net/index.html

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BRE Motorsports in Concord is another shop w/NASA Racers - they are an Official NASA-SE Inspection Station
http://www.bremotorsports.com/

Call Luke Belverd (704) 723-9235

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You could also check with Conover Motor Sports in Burlington, NC. They do prep work for race prepped Miata's, Honda's, and VW's. http://www.raceconover.com

Give them a call and ask for Cameron.

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Check with Estus White at E-Speed Motors in Kannapolis, he's been a Mazda mechanic forever and builds some of the best Spec Miatas on the East Coast. His number is 704-224-1196 or 704-224-1344, and he does all forms of regular maintance. Give him a shot he's pretty reasonable.

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In Matthews, there is Sports Car Authority which has prepared cars for SCCA for decades and also has a chassis dyno. They also do the high end work for CarMax, being very reputable. Give John a call at 704-847-7742....he also won the Presidents Cup in 1999 for having two class wins at the runoffs! He knows his stuff obviously.

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