Hi wayne, did a quick search for you and found these on the Porsche site, hope they help, that's all I could find. Not 100% sure if they apply in your situation though.
http://www.porsche.com/usa/models/911/911-gt3-rs/indetail/chassis/
http://www.porsche.com/usa/models/boxster/boxster/featuresandspecs/?gtabindex=3
I added the other link just in case others were interested in what the other things did.
Anyways, cheers
