RGR / FSPE "ULTRA" NA/NB Rear Diffuser

RGR / FSPE "ULTRA" NA/NB Rear Diffuser
Fitment:
- 1989-1997 NA Miata 
- 1999-2005 NB Miata

Designed, engineered, and fabricated in collaboration with FSPE & RGR, our NA/NB Diffuser is the product of many hours of work and fine-tuning.

We have taken the original FSPE "Monstrosity Junior" and taken it to the next level.

With the help of CFD and string testing validation, we have managed to design a diffuser that is extremely easy to install without compromising on efficiency.

Our diffuser offers unique solutions like our engineered end plates that separate dirty air coming from the rear tires and create an even low-pressure zone all across the width of the diffuser. Other features include a rear mounting bracket with threaded inserts that allows the diffuser to be installed in 3 easy steps, and the ability to adjust the height of the diffuser so it can work with cars with a variety of rear bumpers.

Our diffuser offers bolt-on, adjustable downforce like nothing else on the market.

Available Finish/Material

• Raw Aluminum - CNC Cut, rolled, assembled, will have surface scratches
• Powder Coated Black Aluminum: Same as raw, but powdered black!

Aerodynamic Benefits
Designed to stabilize and smooth airflow just behind the car resulting in:

• Reduced drag
• Improved high-speed stability
• Downforce gains

Kit Includes

• Rear Diffuser
• Mounting Brackets
• Mounting Hardware

Instructions / Packing List
- NA Miata can be found by clicking HERE
- NB Miata can be found by clicking HERE