Last week I swapped Muscle wheels onto my '09 DX. I put on about 300 miles since and have noticed a rear wheel "hum" coming from the left side. I think I remember reading that this may happen without a F rotor on the rear...? Also, last night I noticed a horrific grinding with the rear brakes as well. The rear brakes are pushing 20k anyway, so I'm going to swap a new rotor and pad this weekend anyway, but should I go with an F setup? Can I go with an F setup? Do I need new calipers as well if I go that route?