i was told the rule of thumb is you are suppose to use the brakes that was in the car the engine originally came out with to be properly engineered and to be confident in your car to brake sufficently when needed, i used the 120y disks in my blue coupe and it was VERY hairy on the track! i wouldn't recommend using the standard 120y disks, you should be using stanza or 200b at a minimum in my opinion! Also depends on the purpose of the car.