2009 Bmw 135i Tires

I bought these tires for autocross. The tires do a lot of screeching and grip is okay. Had issues getting the tires installed through Simple Tire, and had to contact the installer myself to get it sorted out. Now, one tire has been peeling and shredding strips of rubber. I believe it is a manufacturer defect. I contacted Simple Tire and they were no help, wanted me to jump through a bunch of hoops to get the tire warrantied. I would not recommend the tires or Simple Tire. Currently ordering new tires through a different company. These Kenda's have less than 500 miles on them.