I've got two questions. MY front pass side shock has some type of fluid on it and the rubber coveer that is on it is as brittle as a rusy nail. I would assume that it is leaking and needs to be replaced. I wnt to go ahead and have all 4 repalced but I want to have a more firm ride. I have read on the board that Boge Turbo Gas are the most popular. So I (1) what would be the recomendations of the board for the best performance but a good ride? Second, there is this annoying knocking sound comming from my rear pass side tire. I have checked all the basic stuff hub cap, wheel, lugs and I actually checked the brake pads and housings but no luck. It is not constant but it comes on for two reasons: moderate to heavy braking and over ruff road. When braking, the knock slows down with the car ie: the slower the car the wider the gap between knocks. (2) What is that noise and how do I solve it? This is my month to get all the suspention work done and I am eager to get started. TIA