I love my BCs with 8k front and 6k rear for track. They’re a bit stiff on the street for my liking but the good thing is they’re designed to work within 4k of spring rate changes. I originally ran 6k front 4k rear which was perfect for dual purpose use but as I’ve gotten faster and added functional arep, the increased spring rate was a necessity to keep them off the bump stops on track. I’ve only had one rear blow from a heavy curb strike but BC overnighted me a new one without any issues. Apparently I was the only one to blow one on the Fiesta at that time so they’re definitely reliable. Zero issues since… A single click in any direction makes a noticeable difference and you have 30 to play with. Definitely a great option. I’ll probably go with their digressive setup when my BRs finally wear out but they’ve been fantastic.