Rotors are 14.25 Wilwood's site let's you put in the vehicle and it shows what they offer. I got the 14.25 slotted rotors front and rear. Drilled rotors don't offer any performance enhancement and they cost more. Even Wilwood will tell you that. That's 6 piston in front and I believe 4 in the back. They are direct bolt on although my BDS front knuckles had to be ground slightly for the mounting bracket to fit. Kits don't include brake lines which were extra and I needed 18 inch lines in the rear to account for the lift. Front and rear kits cost me $2250 each for a total of $4500. Labor was $600 so $5100 not including brake lines or fluid. I put around 15k in my upgrades counting wheels and tires, line-x'd steps, Borla exhaust, BDS lift, brakes, and flares but I paid off the truck in April and I plan to keep it forever. Sent from my Pixel XL using Tapatalk. My build thread: http://www.gm-trucks.com/forums/index.php?/topic/192614-Tenscourts'-2016-LTZ/Z71-CCSB-4WD-Silverado