i dont' see why it would be an issue. They're both d-series parts, just different OBD electronics. It *should* work, but don't qoute me on it. There probably isn't that great of a difference in manifolds between the Y8 and A6, both cam off of 1.6L's and should both have really good flow. So yeah, they're about the same in my book. The Y8 might flow better cuz it came off a VTEC motor....would have to search for flow charts. <_<
