The two holes are to secure the rotor to the hub. Yes the rotors are vented. If you Google pics of the stock 3kgt vr4 brake setup you will see it does not use the full rotor surface area just the same as my setup. I see where you guys are coming from and I thank you for the feedback but I have no doubts it will be fine and perform awesomely. I will be doing a 6 lug setup soon as my friend is really wanting to do it after seeing my setup.
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