CARS Just released Bulletin 2013-08 with some rule changes for this year that folks should be aware of effective May 1st. I bolded the key parts that are new/significant to the best of my knowledge.

To summarize:

1) For production class:

12.8.5 Mechanical Components
Suspension, differential, clutch, pressure plate and flywheel are free.
Brakes are free but must retain the OEM pedal box and equal number of master cylinders as OEM. OEM
pedal box being the OEM brake pedal, location, mounting and actuation. An additional master cylinder for
a hydraulic hand brake is acceptable.

2) First Aid Kit changes:

12.3.5 First aid kit
The first aid kit must be easily accessible, clearly identified and the complete kit easily/quickly removable
by hand.
It is recommended that the first aid kit be accessible from both sides of the car and from the seated
position.

3) Tow Rope:

12.3.16 Tow Rope.
All vehicles must carry a tow rope or winch with cable
All parts of the tow rope must be within the competition vehicle at all times while the tow rope is not in
use.

4) Production Class Weight Reduction:

- The main unibody must remain as OEM.
- All doors and front bumper beam must remain as OEM.
- Side, roof, pillar, door and rear mouldings may be removed or modified. (see NRR 12.3.15)
- Center console may be removed or modified.

The full text of the Bulletin hasn't been posted to the CARS site yet, I'd imagine it will be posted shortly. If anyone wants a copy let me know and I'll email it to you.

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2005 Forester XT (Daily/B2Tuned), 2000 Subaru Impreza 2.5RS P4WD Class Rally Car, 2006 WRX RallyCross Car (Sponsors: Rally-Tech, Great North Performance, ISI Automotive)
Check out: Rally East, The Ledwidge Lookoff Rally