Haven't seen anything about you completing the idler arm change out? As far as the Bilstein 4600. Didn't know how bad the old ones were, but its a firm, not quite stiff ride now. Silky smooth on the highway. Make sure you have a drift pin to drive the bolt out of the LCA if it is stuck, and I had to heat the heck outta them to get them out. It was handy to have 2 18 mm sockets, for the rear, a breaker bar, a 3/4 and a 1/4 open end wrench, and a suitable hammer. I beat one of the bolts so bad to get it out, I had to replace it. Not easy to find.