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You want a smaller blower pulley to up boost or a bigger crank pulley. My A6 kit has a 4 rib blower pulley but it only came with a 3 rib belt because the A6 has a 3 rib alt pulley. I have already upgraded the crank to a Y7/8 crank which is 4 rib so all I would need is the alt pulley to make it a full 4 rib setup. There is plenty of room but on some other civics its close to the MC. So if you got room go for it.
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