Rick,
Kirk Racing is located just north of where I live in Central Alabama. Yesterday, at an SCCA slalom, I spoke with a fellow who knows the owner and has one of his roll bars in an M3. He spoke highly of the quality of his work. He builds roll bars for a major racer and supplier of BMW performance products. He is also very popular with the local road and circle track racers. The guy was very satisfied with his work scheduling. His bar was completed on time and his car was only at the shop for two days for the actual installation. Not sure how all of this transfers to headers, but the business appears to be sound and honest.