I have had mixed experiences with them. They will not deny you service based on mods and will work on a modded car to find the problem. But, when they do find a problem, they are quick to blame an aftermarket part. They blammed my intake which was sold to a person in Florida for brakes failing on my tiburon. In reality it was the check valve in the brake booster line. They are a bunch of really nice guys though. Just dead set in following Hyundai's crappy rules.