Top Secret Co., Ltd. (株式会社トップシークレット, Kabushiki-gaisha Toppu Shīkuretto) is a Japanese automobile tuner and parts manufacturer.

Top Secret's current product lineup consists of aero, exterior and interior, engine, exhaust, chassis, brake, suspension, and powertrain parts.

[6] He is well known in the JDM car community and became universally known because of reposted clips on different social media platforms of these illegal high speed runs.

Only cars that Nagata deem to be the best and most accomplished projects that represent the epitome of the Top Secret tuning philosophy receive this special gold paint scheme.

[12] Top Secret won the 2007 Tokyo Auto Salon Championship with its "Final Evolution" V12 twin turbo Toyota Supra.