Would anybody know what the factory recommended tire pressure for the X3 with Sport Package is (the wheels are 18")? I'm looking to get some Tire Pressure Indicator Caps and the options are for 32 psi or 34 psi caps. I don't have access to the manual or the X3 (wife drives it). Thanks.

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2006 BMW X3 3.0i
Alpine White/Black Leather/Aluminum Trim/Premium/Sport/Cold/NAV/Xenon/Panorama/Steptronic/Servotronic/DSP/Privacy Glass/Rear Airbags/Alarm/Blah/Blah/Blah