No, it's not all about looks. FRS being front wheel drive with engine at front all the weight is at the front so about 90% of the stopping power is needed at the front. But as I'm upgrading to grooved discs on the front I am kinda naturally thinking the rear's should be grooved so as to not over advantage the front set up or put out of balance so to speak.

I'm no pro on this matter but if I put AP calipers on the back would this not cause the back end brakes to lock up?