I've been taking my car to Tune Dynamics for about 20 years. The most recent visit was to replace my timing chain. Before that, they did my brakes. I never need an appointment. I always get helped pretty quickly just being a walk in. They are fast and efficient. They let me know if they find any problems while they're working on my car. Their pricing is a little high, but, I never have any problems when they work on it. I would recommend them.