I put Eibach Multi-Pro R1s on my RT a couple weeks ago. These have one 10 position clicker per damper. Ride height is adjustable via the threaded spring seats.
They look very much like the photo here:
Eibach Springs - Performance Suspension, Lowering Springs, Shocks, Sway Bars, Coil-Overs and Wheel Spacers!
Theses are supposed to allow you to retain the factory ride height. You can in the front but I was still about 1/2" short in the back with the seats adjusted as far as I thought was prudent.
The front spring rate is 550 pounds. There is a 150 pound helper spring, but it is coil bound at rest, and almost completely coilbound at full extension if the spring seat is adjusted for factory ride height. I think the stockers are somewhere in the early to mid 200 pound range.
If I am reading the rear spring markings correctly, it looks like mine are 702 pounds... though a tech at Eibach told me they are supposed to be 960 pounders. Eibach markings are a little cryptic with several numbers seperated by periods... I may be misreading, or perhaps I just ended up with a softer spring than was in their spec.
My car is otherwise stock. I found I like the front dampers set at click 6 of 10, and the rear at click 5 of 10.
The increase in performance is dramatic. The car does rides stiff, like a driving enthusiast's car should be IMO. There is little squat on acceleration or nose diving on braking. Body lean during cornering is reduced greatly.
The nauseating float the car had is gone. I swear my stock RT bobbed and floated like my Mom's Ford LTD wood panelled station wagon that I used to drive as a teenager back in the early 80s.
But here is the real reason I ditched the stock setup... with the stock suspension the car would pound the bump stops at high speed on dips and heaves, then come rebounding off in a dangerous manner, then float & weave a bit until it settled down again.
I wanted full bump travel, more spring, and more damping. (I can't imagine how bad the car must be at speed with soft aftermarket lowering springs and the stock dampers). I also believe there is something to be said for maintaining good independence at each corner by leaving anti-roll bars relatively mild. So for now I am sticking with the stockers.
Anyhow the car is much more confidence inspiring, safer, and substantially faster with this setup. IMO if you want a faster Challenger, the suspension is the first obstacle, then the brakes, then the engine.
With stock 18" tires I run about 34.5 PSI in the front and 31 in the rear. The handling balance is towards understeer. However the car can be pushed to pretty rediculous speeds before that becomes an issue. At lower speeds of course, that tendancy can be overcome with a healthy dose of throttle.
And then the bad news... the front coilovers in this kit do not use the OEM rubber isolater at the top of the coilover. Instead a metal plate with a spherical bushing are used. That would be fine but the noise in the car is absolutely horrendous. On small choppy bumps it literally sounds like the bolts holding the damper on are completely loose and that something major is about to fall off at any minute. I can not believe that anyone would find the level of klunk, klunk, klunking acceptable on a car that is driven on the street... I wouldn't even want it on a race car myself.
However, Eibach is sending me the springs from their Pro S kit. Their coil opens at the top like OEM so the rubber isolator can be used. They tell me the factory ride height can still be retained. That spring is only available in a 500 pounder though so I will lose a little spring rate, but I will still be able to use what appears to be an excellent adjustable damper.
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