if it matters to you..... check all the brands to see if the cooling vanes are side-specific....
... many mfg's use the same casting for both left & right rotors.... therefor, the cooling vanes will inevitably be in the wrong direction on one side of vehicle.....
does it matter? prolly not for the average daily driver.....
also, find out what grade of cast iron is used for the rotor.... 3000 series is common & meets minimum federal standards....
3500 & 4000 have higher iron content & will perform better in extreme use...
i just installed stoptech high-carbon slotted S5 rotors & sport pads on my A5..... so far i am quite pleased.....
dimple or slotted are fine, stay away from drilled for a street application.
jmho... ymmv....
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