Hello fellow Mustang enthusiasts! I've got an upgrade dilemma. Since last trackday season, I've been contemplating a brake upgrade for my 13 Boss. I've been running the stock Brembo 4 piston brakes with 3" ducts, Castrol SRF, 1mm Ti shims, and the popular Pagid RS29/56 combo. While brake performance has been good with these changes, I've found that I'm running through pads and rotors very quickly. On top of that, my piston dust boots have long since disintegrated. Last I checked, front pads would go about 5h before being toast, with 1 pc centric blanks lasting not much longer. It's even worse on hot days. This is all from (mostly) Thunderhill and Sonoma. The last straw for me was missing a session because I couldn't get my pads changed in time (kinda my fault: forgot some tools; spent ages trying to get the second 1mm shim in). When I read the initial impressions for the popular S550 6 piston swap in steveespo's thread, I immediately had my sights set on that. The huge increase in pad size, the increase in thermal capacity of those bigger rotor, and the relatively low price of the upgrade made it a no-brainer. Problem is I'm running into these issues with the stock tire size on BFG Rivals and RE-71s, and I plan on suspension upgrades with the Cortex JRIs and going 305 square on Apex's 18x11. I'm looking to run NT-01s or R888Rs and currently have no plans for slicks. This got me thinking that the 6 piston upgrade might just be a stopgap measure, and a waste of money if I later have to upgrade to something like the AP/Essex CP9668 kit, or similar. After reading a bit about the AP Racing kit, and learning that several members here are getting 15 hours (!) on the (endurance version) pads and 30+ hours (!) on the rotors, I am seriously considering them over the s550 6 pistons. Of course, the big price tag is holding me back... So, question for you guys running the S550 6 pistons, what has your experience been with them? How many hours do your pads and rotors last? Are you happy with the upgrade or would you recommend going straight for a competition-style BBK? Sorry if this has been answered before, my google-fu was not strong enough to lead me to a definitive answer similar to my situation. Also, I would especially appreciate input from those who are running 305 square or similar. Thanks for your input, guys, and happy driving!