Roger that, other than the fact the aftermarket PH would help locate the rear axle better than the stock one with it's jelly-filled doughnuts for bushings. I just replaced the bushes with poly in the stock arm and it settled the rear down nicely on my last Mustang (a 2012 BBP). The body stopped racing the axle to see who could get to the ditch first. I did the same thing to my 2014 but, bc it's an auto, it didn't really need the help as much.
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 11.42 at 120.64
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