In the automotive sector, Japanese manufacturers agreed that no production car would exceed 276 hp (206 kW; 280 hp); the agreement ended in 2005.  German manufacturers limit the maximum speed of high-performance sedans (sedans) and station wagons to 250 km/h (155 mph).    When the Suzuki Hayabusa motorcycle surpassed 310 km/h (190 mph) in 1999, fears of a European ban or severe repression led Japanese and European motorcycle manufacturers to agree on a cap of 300 km/h (186 mph) in late 1999.  See the list of the fastest production motorcycles. Gentlemen`s agreements were a widespread discriminatory tactic that, according to reports, was more common than restrictive alliances to maintain the homogeneity of upper-class neighborhoods and suburbs in the United States.  The nature of these agreements has made it extremely difficult to prove or prosecute them and have been long after the U.S. Supreme Court`s decisions in Shelley v. Kraemer and Barrows v. Jackson.
 One source indicates that gentlemen`s agreements “undoubtedly exist,” but that their use has declined sharply.  A gentlemen`s agreement or gentleman`s agreement is an informal, non-legally binding agreement between two or more parties. It is usually oral, but it can be written or simply understood as part of a tacit agreement by convention or mutually beneficial label. The essence of a gentlemen`s agreement is that it relies on the honour of the parties for its execution, instead of being enforceable in one way or another. It is different from a legal agreement or contract….