2005 porshe cayenne turbo
 

need to know what size rotor goes on the front 350, 330???

It depends. I know that's not the answer you wanted but there were at least a couple different sizes. But I think probably the most common is 350mm.

Mine has the big brakes on it so they are 380mm two piece rotors on front. But that only came with the iE81 turbo power kit option. Unfortunately way more expensive than the 350mm ones too.

It looks like ECS only shows the two sizes here for '05 turbo.... http://www.ecstuning.com/Porsche-200...raking/Rotors/