QA1 Six-Link Rear Suspension Conversion Installed

Yeah but if you run this kit, you MUST run a tire size that would fit with all the stock components. There's no room to go bigger. Looking at how the links are mounted to the axle and routed, you get zero extra room for tires compared to having the leaf springs in the stock location. Which means on a Dart that's lowered you'll be lucky to run 245's. That's simply not competitive for autoX or roadracing. The guys that have had success autoX'ing in competitive circles are running 275's at the minimum. And since you can run a 275 up front with little to no modifications, you're seriously missing out if you're running the 6-link on a Dart/Scamp/Valiant. And even if you do have a Duster/Demon/Dart Sport you're limiting yourself to 275's. I run 295's out back on my Duster, but it takes a 1/2" offset to do that and the 6 link won't work with that (at least currently). And then there's the ride height, it sets the roll center at the stock height and only allows +/- 1" for adjustment. For a serious racer that means you can only lower the car 1" at the most, because you're going to lower it as much as physically possible.

Sure, if you want to hit the occasional autoX or track day for fun it's not a huge deal, but if you're trying to be competitive this isn't the system you're going to use. And if you're just going out for fun occasionally you can do that with leafs and a sway bar and save a few grand. So, if it's not good for a street car (dumped exhaust) and it's not good for a competitive car (tire limits) then I'm with replicaracer, it's just a "looks cool" coilover conversion that costs a lot of money and wouldn't necessarily make you any faster.