Top Secret M24 Rear Bumper & Rear Under Bumper for R35 Nissan GT-R

The Top Secret M24 rear bumper and under bumper kit brings race-proven aerodynamic development to the street in a form designed for the R35 GTR. Built as the latest specification rear bumper in the M24 lineup, this kit was developed with full compatibility in mind for the M24 full bumper kit and is engineered to fit all R35 GTR model years. Top Secret pursued what they describe as a “kingly form” a shape befitting Japan’s strongest sports model, while keeping performance at the center of every design decision.

Construction and Materials

• The kit uses a three-piece structure split across two distinct materials chosen for their specific roles. The bumper section is constructed from high-strength FRP (fiberglass reinforced plastic), which provides the structural rigidity and shape retention needed for a functional aero component. The underbody section is finished in top-quality dry carbon, a material chosen for its weight savings and stiffness. Dry carbon differs from standard wet-lay carbon in that it is produced under vacuum pressure and heat without excess resin, resulting in a lighter and more dimensionally consistent part. The combination keeps overall weight low while maintaining the strength the aerodynamic design depends on.

Aerodynamic Development

• The geometry of this bumper is rooted in Top Secret’s aerodynamic theories, developed through years of competition on demanding high-speed stages. Rather than a purely visual upgrade, the M24 rear bumper is shaped around performance principles that have been tested at speed. The underbody section in dry carbon works with the bumper’s lower profile to manage airflow at the rear of the vehicle, contributing to the overall aerodynamic balance of the M24 kit.

Fitment and Installation

• The Top Secret M24 rear bumper and under bumper kit fits all R35 GTR models. The product ships unpainted and is designed with the assumption that installation will be carried out at a sheet metal body shop. Two model-year-specific requirements apply. For installation on 2011-2023 models, a separate dedicated under panel is required and sold separately. For installation on 2007-2023 models, genuine rear fog lamps from the 2024 model year or later are required prior to fitment.

Features

• Three-piece FRP and dry carbon construction
• High-strength FRP bumper section
• Top-quality dry carbon underbody section
• Fits all R35 GTR model years
• Developed alongside the full M24 body kit
• Rooted in Top Secret’s high-speed aerodynamic development
• Ships unpainted

Applications

• Nissan GT-R: CBA-R35, DBA-R35, EBA-R35 | 2008-2025

Notes

• Separate dedicated under panel required for 2011-2023 model year installations
• Genuine 2024-2025 rear fog lamps required for 2007-2023 model year installations
• Professional body shop installation recommended

Frequently Asked Questions

Does the Top Secret M24 rear bumper fit all R35 GTR model years? Yes. The Top Secret M24 rear bumper and under bumper kit is designed to fit all R35 GTR model years. However, installation on 2011-2023 models requires a separate dedicated under panel, sold separately. Installation on 2007-2023 models also requires genuine rear fog lamps from the 2024 model year or later before the kit can be fitted.

What materials is the Top Secret M24 rear bumper made from? The Top Secret M24 rear bumper and under bumper kit uses two materials across its three-piece structure. The bumper section is constructed from high-strength FRP (fiberglass reinforced plastic). The underbody section is made from top-quality dry carbon, which is lighter and stiffer than standard wet-lay carbon fiber due to its vacuum and heat cure process.

Does the Top Secret M24 rear bumper come painted? No. The Top Secret M24 rear bumper and under bumper kit ships unpainted. Paint and finishing should be handled by a qualified body shop prior to or during installation.

Is professional installation required for the Top Secret M24 rear bumper? Top Secret manufactures this aero kit with the assumption that installation will be performed at a sheet metal body shop. Professional installation is strongly recommended to ensure proper fitment, alignment, and finish.

What is the difference between the bumper section and the underbody section? The Top Secret M24 kit uses a three-piece structure split between two materials. The upper bumper section is made from high-strength FRP for structural rigidity and shape. The underbody section is constructed from dry carbon for reduced weight and increased stiffness, contributing to the aerodynamic performance the M24 kit is built around.

Is the Top Secret M24 rear bumper part of a full body kit? Yes. The Top Secret M24 rear bumper and under bumper kit was developed with compatibility in mind for the full Top Secret M24 bumper kit. It is the latest specification rear bumper in that lineup and is designed to work as part of a complete M24 aero system.

About Top Secret

In 1991, Kazuhiko Nagata became independent from Trust, and Top Secret was established. Since its debut at the Tokyo Auto Salon in 1993, Top Secret has garnered various awards. From 1994, Nagata has participated in speed trials, including 0-400km/h, 0-300km/h, 0-1000m, and top speed challenges, achieving notable speeds such as 341km/h on Germany’s Autobahn, 358km/h at Nardo in Italy, and 340km/h on public roads in the UK. Top Secret has also been a significant contributor to the global JDM culture, participating in events like the Super Taikyu Race and the D1 Grand Prix, not only in Japan but also in the United States and the United Kingdom. Top Secret’s demo cars, including the BNR32 GT-R, BNR34 GT-R, R35 GT-R, and JZA80 Supra, all finished in the signature Top Secret gold, consistently draw attention.