Its no surprise that splitter tunnels add downforce to the front of your car. These tunnels were designed in CFD by a former Mercedes F1 Aerodynamicist (now freelancing as JKF Aero) and then the molds were CNC cut and produced in house. They are slightly smaller than our Large Curved or Large Straight tunnels, but their slightly more compact design allows them to fit into tighter spaces while still providing a huge downforce increase. They can be upgraded with strakes (fins) or had blank. Just place on your existing splitter, trace, and cut out a slot to drop them in. The flange of the tunnels should be on the bottom of the splitter. We recommend bolting them in. Hardware not included.