Does this diffuser need to be run with the vortex generator to actually generate downforce, or does it work on its own?

The Top Secret A80 Supra diffuser is engineered to function as a standalone piece; the vortex generator adds incremental airflow management on top of it, but it isn't required for the diffuser to do its job.

Will this diffuser clear a cat-back or aftermarket exhaust setup on the JZA80?

Clearance depends on your specific exhaust routing and tip placement, since the diffuser's flat, upswept design sits close to the underbody; check your exhaust layout against the diffuser's profile before ordering.

Does lowering the car affect how this diffuser performs?

Ride height changes the angle of attack the diffuser sees, so a Supra running aggressively lowered suspension may need the underbody geometry rechecked to keep the diffuser working as designed rather than scraping or stalling airflow.

Description

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Description

Top Secret Carbon G-Force Rear Under Diffuser for A80 Toyota Supra

The Top Secret A80 Supra diffuser reshapes the rear overhang into a flat, upswept profile that speeds up airflow underneath the car and turns it into usable downforce. It’s the same underbody thinking behind Top Secret’s high-speed A80 builds; the less turbulent air fighting the underside of the car at speed, the more stable the rear end stays. This diffuser is built in lightweight carbon fiber, which keeps it from adding meaningful weight to the rear of the JZA80 while still giving it the exposed-weave look Top Secret’s carbon parts are known for. It’s designed to work as a standalone underbody piece, but Top Secret also offers a vortex generator and a center side set as separate add-ons for buyers building out the full underbody package.

Features

Flat, upswept rear overhang shape
Accelerates underbody airflow
Generates rear downforce
Lightweight carbon fiber construction

Applications

Toyota Supra: A80, MK4 | 1994-1998

Notes

FRP version is delivered unpainted
All Top Secret carbon is delivered in its raw state and will require prep and application of a UV resistant clear coat and/or PPF

Frequently Asked Questions

Does this diffuser need to be run with the vortex generator to actually generate downforce, or does it work on its own? The Top Secret A80 Supra diffuser is engineered to function as a standalone piece; the vortex generator adds incremental airflow management on top of it, but it isn’t required for the diffuser to do its job.
Will this diffuser clear a cat-back or aftermarket exhaust setup on the JZA80? Clearance depends on your specific exhaust routing and tip placement, since the diffuser’s flat, upswept design sits close to the underbody; check your exhaust layout against the diffuser’s profile before ordering.
Does lowering the car affect how this diffuser performs? Ride height changes the angle of attack the diffuser sees, so a Supra running aggressively lowered suspension may need the underbody geometry rechecked to keep the diffuser working as designed rather than scraping or stalling airflow.

About Top Secret

Top Secret Co., Ltd. (株式会社トップシークレット, Kabushiki-gaisha Toppu Shīkuretto) is a renowned Japanese automobile tuner and parts manufacturer, founded by automotive engineer and driver Kazuhiko “Smokey” Nagata. The company is widely recognized for its expertise in tuning, aftermarket parts, body kits, and performance engineering. Top Secret’s product range includes aero components, exterior and interior parts, engine upgrades, exhaust systems, chassis, brakes, suspension, and powertrain enhancements. In addition to its products, Top Secret is also famous for its high-speed Wangan runs, as well as its involvement in professional drifting, circuit racing, and drag racing.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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