most quaife run 900 to 1000$ with 20% off thats about 800$ plus shipping and ill guess that will cost about 150 . so about the same as the wavetrac. these 2 diffs are almost identical. i think its really a matter of who makes them available first. for the g/b on the wavetrac i think everyone is willing to ride it out. this would be a great alternative to those who aren't on the list or on standby. unitrax would be able to install either diff with accuracy