Anglesey Circuit had its new pit complex opened by the Welsh First Minster Carwyn Davies on Sunday as part of the continuing development of Wales' biggest motorsport venue.
The £1m facility, which benefited from a Welsh Assembly Government grant of £200K, includes a state of the art three-storey control tower and 22 double pit garages.
“This project is already transforming the business here, attracting new, prestigious clients and expanding the range of activities beyond the weekend boosting employment and income to the area," said Davies.
"It is good news to hear that new clients include leading Formula 3 and GT teams, as well as major car manufacturers, for both product testing and launch purposes.
“Investment and growth here have helped raise the standards of the facilities here to international level, which will be a boost to the area.”