Today I just bought my first Infiniti g. It is a rare xs sedan and it is going to need new brakes soon and I was wondering what size should I get? I have had people tell me to get 12.5" front rotors and some say 12.9" please help!

OEM size. Pads and tires are a bigger contributor to braking on the street than size of rotors, imo. Hawk pads, oem rotors fresh hydraulic fluid, flushed and replaced.

Well after buying the wrong kind, it's the 320mm front/307mm rear that you wanna go with. Basically, go for the ones that are for the 2008 G35X. The G35S has 330mm rotors front and rear.

Did you end up figuring this out? I need to swap calipers too and don't know what size will fit.

Thanks.