Top Secret Body Kits: G‑Force, Supra & R35 Aero Explained

Top Secret Body Kits

Top Secret is more than a tuning shop—it’s a legend born from sheer audacity and a love of speed. Founded by Kazuhiko “Smokey” Nagata in 1979, the Japanese outfit shot to fame thanks to its founder’s headline‑grabbing high‑speed runs (including a 194 mph blast down a UK highway that resulted in a ten‑year ban). But while Smokey’s antics made the headlines, it’s Top Secret’s beautifully engineered body kits and aero parts that have kept enthusiasts hooked for decades.

Design Philosophy: Balance Power With Aerodynamics

Smokey Nagata knows that simply adding horsepower isn’t enough to go faster. Top Secret’s aero kits are designed to provide enough downforce to keep a car stable at high speeds—without generating so much drag that top‑end performance suffers Motortrend.com.. This is why Top Secret kits often look sleek and understated compared to more flamboyant GT‑style bodies: they’re built for real‑world Wangan runs as much as for show.

G‑Force Aero Kits: Subtlety Meets Function

Top Secret’s G‑Force aero line is aimed at drivers who want improved aerodynamics without turning their car into an exaggerated widebody. In a Speedhunters feature on the Top Secret G37, the author notes that “Category 1” G‑Force kits consist of half front and rear bumpers plus side skirts, with a carbon‑fibre version available. The kit complements the car’s curves rather than overpowering them, demonstrating Top Secret’s restrained approach.

Super G‑Force Supra: The Kit That Went 200+ mph

When Smokey built the now‑famous TS8012V V12 Supra, he started with an extreme widebody kit called Super G‑Force Wangan, also known as “Final Evolution.” The ¥600,000 kit was intended as a futuristic evolution of the Mk IV Supra. It features custom headlights and angular lines that dramatically change the car’s nose. MotorTrend highlights that the kit widens the car by 33 mm at the front and 50 mm at the rear Motortrend.com. SlashGear adds that the Super G‑Force Wangan kit includes a lower rear wing and redesigned nose to reduce lift while still generating enough downforce for stability at speeds approaching 230 mph, slashgear.com. The full kit typically includes a widebody conversion, aero bonnet, rear spoiler, rear under‑diffuser and replacement front bumper.

R35 GT‑R Kits: Cooling Meets Downforce

Top Secret didn’t forget about Nissan’s GT‑R. The R35 Full Bumper Kit V2 enlarges the lower front opening to improve cooling and integrates a diffuser to increase downforce. An optional removable louver lets owners adjust the look and aero effect, and an additional air guide can be added for even better cooling. The kit is available in FRP or carbon fibre and can be fitted to all model years, making it a popular choice for high‑power R35 builds.

Beyond Supra & GT‑R: Other Top Secret Creations

Top Secret’s catalogue includes aero parts for cars like the Nissan 350Z and 370Z, as well as the Toyota Aristo, Celica and even the Infiniti G37. The company’s “G‑Force” naming convention means each kit is tuned for a specific balance of form and function—often with multiple categories to suit different tastes. And while some of the most extreme kits (like the Super G‑Force Supra) are no longer in production, the philosophy of combining subtle aero tweaks with outrageous performance lives on in every Top Secret build.

Why Enthusiasts Still Covet Top Secret Kits

A Top Secret body kit isn’t cheap or easy to install. Many pieces are made from high‑quality FRP or carbon fibre and are often custom‑made to order. But owners swear by their fitment and performance. Each kit is engineered with high‑speed stability in mind, informed by Smokey Nagata’s love of Wangan runs and standing‑mile events. The subtle yet purposeful styling also sets Top Secret apart from more flamboyant brands—think elegant, functional lines rather than tacked‑on flares. Because the company limits production, genuine Top Secret parts hold their value and are highly sought after among collectors.

2013 Nissan GTR build, featuring TopSecret Japan inspiration

Final Thoughts

Smokey Nagata’s Top Secret isn’t just a tuner—it’s a piece of JDM folklore. From the infamous A1‑motorway run that landed him in hot water to record‑breaking speed attempts in Italy, Smokey’s escapades have given his brand an almost mythical status. But beneath the legend lies serious engineering. Top Secret body kits strike a delicate balance between aerodynamics and aesthetics, offering enthusiasts the chance to own a slice of high‑speed history. If you crave a restrained widebody look without sacrificing performance, a G‑Force or Super G‑Force kit might be the perfect upgrade for your project car.

See also: If you enjoy stories about iconic body kits, check out our deep dive on VeilSide body kits for more inspiration.

Sources & Further Reading

• MotorTrend – Top Secret V12 Twin Turbo Toyota Supra (https://www.motortrend.com/features/130-0704-top-secret-v12-twin-turbo-toyota-supra)

• Speedhunters – Top Secret V12 Twin Turbo Supra (https://www.speedhunters.com/2009/08/car_feature_gt_gt_top_secret_v12_twin_turbo_supra)

• Speedhunters – Top Secret G37 (https://www.speedhunters.com/2009/11/car_feature_gt_gt_top_secret_g37)
  

• Nengun Performance – Super G‑Force Supra Aero Parts (https://www.nengun.com/top-secret/super-g-force-supra-aero-parts)

• Nengun Performance – R35 Full Bumper Kit V2 (https://www.nengun.com/top-secret/r35-full-bumper-kit-v2)

• SlashGear – Smokey Nagata’s Toyota Supra (https://www.slashgear.com/1527878/everything-jdm-fans-should-know-smokey-nagata-toyota-supra)

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