Very nice update for my Regal GS, I couldn't believe the difference in braking distance. The reason I didn't give 5 stars is because every morning the first couple of brake stops scream very shrill. Didn't have time dia. Problem, I've been a tech for 40 years so I know they were hacked and installed correctly. Would appreciate help if anyone else had this problem. Sincerely, Knoxville Tn.