Coopers don't have a good rep amongst tire guys, they call them cuppers because of the cupping that they tend to.
Hopefully Pepboys have a good warranty on them.
I found out the hard way about Cooper tires. Scream like a banshee after a couple thousand miles. It helped when I rotated them like old bias ply tires vs the way they are supposed to be. Got a little quieter.(heavy lug mud tires)