It's a Cortex racing watts link
Excellent, I am looking at this myself as a future mod.
Have you had a chance to track the car with it installed yet? If so--what are your thoughts vs. the stock PHB setup?
Also what are your plans for changing the diff fluid--are you going to disassemble the Watts and take the cover off each time, or are you going to use the cooler pump to evacuate the pumpkin?