I'm not sure if I read this properly, but the $400 you're saving is for 2 pistons, the ones tnat most companies (ie. mustangparts.com) sell for $399 are the '99-up Cobra calipers, yes. But these are 2-piston calipers, where the corvette calipers and the $800-$2000 kits are 4-piston calipers, or...