whats up guys, i got a question for the gurus. I want to mate some good valve springs to my s4's. Im greatly leaning towards the greddy valve springs. I have had a good experience so far with the greddy products installed. I spent about 4 hours, tonight alone, searchin for an answer. But i want to know if u can use Brian crowers dual valve springs with jwt cams. Ive seen the dual valve springs for a decent price. I would feel more safe revving with the duals. Not really tryin to rev as high as 9k. like 8k or so......Any opinions??????