Wait, your saying the SFI dampner from ZZP is a Underdrive pulley itself or I would have to make the rest of the pullies(WP,ALT) underdrive to feel a difference?
yeah but not only is my stock damper MILES old, yes I only want it for stability and the extra strength(for my build). I would put a new stock one back on but why not go with something better, you know.....