Suspension help.

[Dark_5.0]

My car squats in the rear hardcore on the launch the passenger side muffler actually scrapes the ground on the launch.

I installed an airbag in the passenger side rear spring and put a torque arm on the motor. The airbag helped a little but not enough.

My current set-up is.

Removed front sway bar
4 banger springs in the front
Steeda sub-frame connectors
Granatelli upper and lower control arms
Air bag in the passenger side rear spring
Torque arm on motor

I am thinking that maybe stiffer springs in the rear would be the answer.