Had a great experience with RC Engineering. I had some questions that I entered online, and the next morning a very conscientious representative called back and fully resolved my concerns. I sent in a set of injectors for cleaning and RC turned them around within 24 hours. With lowest-tier shipping to and from the east coast it took a little over a week. They supplied before and after test documentation for each injector, and installed new screens and o-rings. RC has been around for a long time, now I know why. Highly recommended.