go fast bits hybrid bov. this is the newer model that is adjustable. this is much better than the original version. you can run 3 different modes - full atmospheric, 50/50, and full recirc. all you have to do is use your stock bov recirc elbow and change the attachments. comes with instructions.
retails for over $299+ brand new. asking $150 shipped. the unit is in great condition.