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Mopar lowering springs, part# P5155436, 206.86 shipping on average between 25 and 45.00 dollars depending on zip code
Mopar Stage 1 Performance Springs are for owners who desire a sporty yet comfortable ride. They reduce ride height 1.0" for that low, custom look. The high-tensile spring material ensures durability and heightens spring performance without bind. These factory-produced lowering springs were designed using Chrysler Engineering specifications to achieve optimal performance. (does not fit SRT8).
NOTE: Lowering Springs Require Shock Change. When fitting the Mopar Lowering Springs on a Challenger equipped with Sachs Nivomat self-leveling rear shock absorbers, please note that a rear shock change is required for proper appearance. Failure to replace the original equipment, self-leveling rear shocks on these vehicles as described will result in a rear ride height that is too high.
our experience is that they will fit on 2011 as well, and they typically lower the car more than 1 inch, usually nearly 2 inches front and 1.5 inch rear. As a rule we did not have to install camber bushings, we have been able to aligned the vehicle within specification with minor gring and oblong the mounting holes.
Also the spring with work with nivomat shocks, however will not work with the self leveling shocks.
Luke

Mopar Stage 1 Performance Springs are for owners who desire a sporty yet comfortable ride. They reduce ride height 1.0" for that low, custom look. The high-tensile spring material ensures durability and heightens spring performance without bind. These factory-produced lowering springs were designed using Chrysler Engineering specifications to achieve optimal performance. (does not fit SRT8).
NOTE: Lowering Springs Require Shock Change. When fitting the Mopar Lowering Springs on a Challenger equipped with Sachs Nivomat self-leveling rear shock absorbers, please note that a rear shock change is required for proper appearance. Failure to replace the original equipment, self-leveling rear shocks on these vehicles as described will result in a rear ride height that is too high.
our experience is that they will fit on 2011 as well, and they typically lower the car more than 1 inch, usually nearly 2 inches front and 1.5 inch rear. As a rule we did not have to install camber bushings, we have been able to aligned the vehicle within specification with minor gring and oblong the mounting holes.
Also the spring with work with nivomat shocks, however will not work with the self leveling shocks.
Luke