I also removed the subframe collars, now the car feels so much nicer. I don't really notice a real "loss" here. No more unnecessary road noise and now I can go over crosswalks without having the whole rear of the car take the shock. RIP $60, if anyone wants them they can have them. Maybe I'll try them with the CV driveshaft, maybe I'll use them as shims for something else lol. I imagine on a drift car they'd make a difference, like Megan Racing advertises for their copy. Definitely not for daily use.