The bigger rear rotors defiantly fill the rear wheels compared to the stock rotors. They are almost the same outside diameter as the front sport brakes....
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I'm one of the few (only?) here with stock front brakes and the rear cobra rotors. After putting on the rear Cobra rotors & new calipers the braking overall was improved, parking brake is much better. Parking brake can actually hold the car on a hill now and could stop the vehicle in an emergency.
The improvement was probably because I replaced the rear calipers at the same time, they were the originals and didn't seem to be working properly.