Hi guys I just bought an LSD for my hybrid Q50 and I had originally decided to go with the Quaife but then changed my mind to the Wavetrac as they were both equally good but just because of the fact that the Wavetrac LSD’s ability to bias under ZERO to LOW load situations. But I have found out from Concept Z Performance that its on backordered due to this statement from them "I heard back on the Wavetrac and unfortunately these are back order with no ETA due to some issues with fitment. Do you want to wait for these still or swap for something else?" So I called them and they were saying that due to fitment issues and complaints its on backorder. Kind of a relief for me now that I recall hearing the same from a mechanic who works on LSD as well. So I guess Quaife is the safest and most reliable option for us Q50 owners in the meantime till this is sorted out.