Ok so I know that the k20z3 came with single valve springs and since I live in the high rpm area(5000-8000). I was planning to swap to dual springs. But with more and more research I do. I keep finding info about on the k20 dropping valves due to uses of incorrect valve keepers/cotters. I know I would have to change out the seats and spring base to the dual if I do this conversion.My questions are .. 1. What type of keepers/cotters do i need? 2. Will the valve keepers/cotters off the 2002 rsx type s work on the 06-11 K20Z3? 3. what would be a good brand of valve springs to go with? 4. Can I just swap to the 02 rsx type s dual valve springs,retainers, spring bases and keepers?