2006 300 Front Brake Squeak

Hello,

     My friend has a 2006 300 with 26k miles. He has developed a
squeaking noise when the front brakes are applied. I was going to
apply some brake quiet to the back of the ****ms but found out that
they are riveted to the pads. 

I think from what I remember the noise began when we had to replace
the front rotors as they were warped. Could it be the brake material
is reacting with the rotors causing this issue? He does a lot of heavy
braking so if he needs to get higher quality rotors, what should he
get?

Thanks in advance,
Nick