I switched from the stock 18's on my S5 to the 20" RS5 rotors and there was a very noticeable difference. I don't know what each setup weighed but the car doesn't accelerate as quick and I definitely use the brakes more, especially in situations where I used to just engine brake. Having said that, it does stick to the road better in turns now with the wider tires. So I'm considering switching to lighter wheels, possibly 19" S5 rotors.
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