This is our 6-Fin Rounded Rear Diffuser Kit for Tesla Model 3! 
 
This kit is compatible with 2019+ Model 3
Kit includes 6 Fins and mounting hardware to attach to factory undertray
This "Rounded" Fin Kit for Model 3 addresses customer concerns about scraping entering parking lots/driveways with a steep incline. The inner fins have a upward-curving design to allow more ground clearance when your car is tilting upward at a steep incline without sacrificing too much of the diffuser fin kit's aerodynamic effectiveness. 
Note -- Satin Black variant is pictured above
 
Our all-new Tesla Model 3 Railer (Jr.) Fin Kit is the perfect solution to the Tesla Model 3's unique situation -- the bottom of the car is already completely flat. Your typical combustion-engine vehicle has many different pockets in which air can be trapped around the driveshaft, exhaust, engine, transmission, etc. and requires a full-bodied diffuser to keep air flowing underneath these potential air traps and fins to direct air out of the rear of the car, reducing rear-end swirl and getting rid of drag. The Model 3's flush underside allows for additional effeciency that can be taken to the extreme. Now a full-bodied diffuser is not required, and weight can be reduced further by only adding fins and excluding the rest. Get the same functionality and the same aggressive look without the extra weight!
 
Pick up our Railer (Jr.) Fin Kit for the most efficient, weight-reduced diffuser solution on the market and enable your Model 3 to slip through the air like a theif in the night!