Their is follow up information about this mod
Here
Long story short. Works good in the back but it will give you more travel in the rear. This is a good and bad thing. It will most definitely cause your rear sub frame to Crack because of the addition travel and flex. (Stock shocks dot allow the rear sub frame to move much) If it’s not already cracked. No big deal. I had my Subframe beefed up and it took care of the issue. I would also say that the 416 shocks are just a bit soft for a stock gem car with flooded lead acid battery’s and 4 peeps.