I bought some Brembo rotors from tirerack and I was wondering if I need to have them turned before installing them.

No.

Are you sure? I'm installing new pads too. Probably just clean them with some brake clean or something to get the oil off them right.

Are you sure? I'm installing new pads too. Probably just clean them with some brake clean or something to get the oil off them right.

2000% sure. just use brake clean and get the coating off.

If there is any rust on the hub, make sure to clean it off and that it's even.
Any uneven-ness in the hub will transfer through the hat in the rotor and cause pulsation.

Also, buy a good torque wrench and torque the lugnuts to 80 ft-lbs. Excessive lugnut torque will distort the hub and the rotor hat, and ruin the rotor.

On 6 speed cars this seems especially critical.

2000% sure. just use brake clean and get the coating off.

Hot soapy water works best, brake clean won't get all the residue off.