Check out the rules section for the 2013 updated rules.
Check out the rules page for the updated 2013 DRAFT rules.
NOTE: These rules are the DRAFT versions and subject to change before being finalized on February 17th, 2013. Please to don’t implement the 2013 updates on your cars until the rules are finalized. They will remain in DRAFT form and are open to feedback until February 17th, 2013.