Added benefits:
Eliminate front tire flat spots that happen when the front tires lock up and the rears are still rolling (and not helping to slow the car.)
Approved for Viper Days events because of the extra factor of safety they provide participants. No points added to your car. (Contact Tom Sessions of Viper Days for details.)
Maintains stock appearance, OEM parts, and originality. Nobody will know why you're such a better driver! No hard to find parts or single vendor sourcing.
Can be replaced by the average home mechanic in about 1 hour.
Replacing the OEM caliper with a 40mm caliper keeps the unsprung weight low. A four-piston Brembo front Viper caliper and the Brembo single piston rear caliper weigh the same! Therefore adding a four piston caliper to the back wheels and a parking brake results in higher total unsprung weight.