i would recommend altered atmosphere in MD. it is less than a mile from turbo xs. The reason i recommend AA is that turbo xs uses a dyno that actually bolts to the wheel hubs in place of the rims. AA actually has a dynojet unit with 4 independent rollers that you simply drive onto and strap the car down to. Turbo xs also charges a $50 setup fee because of the time it takes to remove the rims and setup the dyno units. Turbo xs typically doesnt sell dyno time to the general public either, they use it for the development of their products.