The spring rates straight from the SRT engineers are as follows
2008 SRT front 210 lbs. rear 525 lbs (which is higher than the 03 to 06 model years)
2008 ACR front 514 lbs. rear 1085 lbs
The SRT Aero package has 500 lbs down force
The ACR Areo package has 1500 lbs down force
So the Down force is TRIPPLED by the ACR package and the and the spring rates of the SRT are only HALF of the ACR springs now hit a bump in the road, *** hole, or some curbing at the track at say 120 mph. what do you think is going to be the result. For those of us that know something about the handeling of thses great cars it may be normal to check out the affects certain changes are going to have on our cars before making them, but some of us are only going for looks, and some of us may drive beyond their potential. This is dangerous even before making and changes. I was just trying to be helpful, that is all! One more thing if adding a wing with usable down force to the rear of a Viper you should also add a front splitter to balance the car.