Tom is the Bomb!!
I have a Birkin (basically a Lotus 7 with a Zetec engine) which I recently delivered into the hands of Tom Lesperance for rebuild, upgrading and tuning. The car is exclusively a track day car and I was looking for extra pop. He turned the car into a rocket ship (a naturally aspirated one). Not only is he very knowledgeable but he is very careful and his prices are reasonable. He comes highly recommended in my book.