MadPSI | Rear Diffuser
carbon fiber, mr2, sw20, toyota
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Rear Diffuser


Clear selection

The MadPSI Rear Diffuser is a shaped section of the MR2’s rear underbody which improves the look and aerodynamic properties of the MR2.




The MadPSI Rear Diffuser incorporates a venturi tunnel to create a venturi effect. The venturi effect is a phenomenon which is described by Bernoulli’s equation. When a fluid, such as air, is flowing through a pipe, and is forced through a narrower section of pipe, the pressure decreases while the velocity increases. This is similar to the Bernoulli effect for enclosed conduits which states that the higher the velocity of a fluid, the lower the pressure. Thus, as the air moves faster underneath the car and through the MadPSI Rear Diffuser, it causes the high pressure air to push down on the car in order to reach the lower pressure air. This creates downforce which exerts a downward pressure on a moving vehicle and helps to counteract loss of control at high speeds. The faster the vehicle is moving, the more downforce is created.




Many composite parts are not smooth. When you look at them at an angle, you see waviness and bumps. When you run your hand across the surface, you feel a rough texture. When you look closely, you may even see small pinholes. To ensure the MadPSI carbon fiber Rear Diffuser has an amazing finish, we implemented special techniques, protected by trade secret, throughout the product development and manufacturing process. Was it more expensive? Yes. Was it worth it? Absolutely. The finish is as smooth as glass. When you run your hand across the surface, it glides effortlessly. Combined with our highest-grade glossy clear coat, it has a stunning mirror-like finish.




Many composite parts have distorted weave patterns, especially on complex surfaces. The weave pattern looks like an absolute mess when there is a concave shape, drop, or curve. Some manufacturers even paint over sections of products to hide areas where weave distortion is obvious. To ensure the MadPSI carbon fiber Rear Diffuser has a straight weave pattern, we use the best manufacturing facility with the best production team. These highly skilled workers are true artisans with over 15 year of experience. Is doing this more expensive? Yes. Is it worth it? Absolutely. The result is a beautiful straight weave unmatched in the industry. We take great pride in our straight weave pattern and instead of painting over it, we proudly display it like artwork in high-resolution close-up photographs.




Many manufacturers use excess leftover carbon sheets from other parts in order to save money on material costs. The result is a visible line where one carbon sheet ends and another starts and a visible misalignment of the weave pattern where the different carbon sheets meet. To ensure the MadPSI carbon fiber Rear Diffuser has the most consistent weave pattern, we construct every carbon fiber Rear Diffuser using a one-piece carbon sheet. We dispose of any excess material. Is doing this more expensive? Yes. Is it worth it? Absolutely. The result is a consistent weave pattern throughout the entire carbon fiber Rear Diffuser with no visible cuts or disjointed lines.




MadPSI uses only the highest-grade carbon fiber raw material in all its products. We use the same materials used in aviation, battleships, satellites, and rockets.

Weight 12 lbs
Dimensions 68 x 40 x 6 in


Shipping and handling rates within the United States are automatically calculated at checkout. International shipping and handling rates are calculated after you place your order and will be emailed to you.