the stock one is surprisingly beefy. I just replaced the bushings with energy suspension ones for $25 and called that done. Believe me, if this part fails, it could easily kill you. The suspension has little to no lateral locating ability because it is a 3 link. It relies heavily on the panhard bar to laterally locate the rear end. PH breaks, the back of the car will become instantly extremely unstable and pitch you into the kitty litter.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto N/A tune. 100 shot nitrous on BBR tune. Best e/t 11.38 at 120.85
2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP