Question: Considering the Porsche 928 and Porsche Cayenne.  Which of the two vehicles was exclusively manufactured before the 21st century?

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Four Cs of 21st century learning: The Four Cs of 21st century learning, also known as the Four Cs or 4 Cs, are four skills that have been identified by the United States-based Partnership for 21st Century Skills (P21) as the most important skills required for 21st century education: critical thinking, communication, collaboration, and creativity.

Socialism of the 21st century: Socialism of the 21st century (Spanish: "Socialismo del siglo XXI" ) is a political term used to describe the interpretation of socialist principles advocated first by Heinz Dieterich in 1996 and later by Latin American leaders like Hugo Chávez of Venezuela, Rafael Correa of Ecuador, Evo Morales of Bolivia, and Luiz Inácio Lula da Silva of Brazil.  Socialism of the 21st century argues that both free-market industrial capitalism and twentieth-century socialism have failed to solve urgent problems of humanity, like poverty, hunger, exploitation, economic oppression, sexism, racism, the destruction of natural resources, and the absence of a truly participative democracy.  Therefore, because of the local unique historical conditions, socialism of the 21st century is often contrasted with previous applications of socialism in other countries and aims for a more decentralized and participatory planning process.  Socialism of the 21st century has democratic socialist elements, but primarily resembles Marxist revisionism.

The Condensed 21st Century Guide to King Crimson: The Condensed 21st Century Guide to King Crimson is a compilation by progressive rock band King Crimson, released in 2006.  It contains select studio tracks from the two box sets, "The 21st Century Guide to King Crimson – Volume One – 1969–1974" and "The 21st Century Guide to King Crimson – Volume Two – 1981–2003".

Volkswagen Group PL71 platform: The Volkswagen Group E platform is a series of automobile platforms shared among multiple marques of sport utility vehicles (SUVs) (4x4s in the European market).  It was co-developed by Volkswagen Group and Porsche AG.  All current platform users share the Volkswagen Bratislava Plant in Slovakia, with the Porsche Cayenne being assembled in the Porsche plant at Leipzig.

Ruf Dakara: The Ruf Dakara is an SUV based on the Porsche Cayenne with some redesigned body panels.  The most notable differences between the two vehicles is the headlamps.  Many Dakara models are 2004 model year Cayenne.  Currently (2008), there are five RUF Dakaras in the United States.  Four are 550 conversions and one is 570, the number referring to horsepower.  The Dakara reaches 60 mph in 4.8 seconds, which is the same result of the stock Cayenne S (4.8 seconds).  Much of the body work is done in carbon fiber, and the headlamps are taken from the current (991/998) model Porsche 911.  Interior includes leather upgrades, and iPod dock, and front and rear-facing cameras.

21st Century Community Learning Center: The 21st Century Community Learning Centers (21st CCLC) initiative is the only federal funding source dedicated exclusively to afterschool programs.  The No Child Left Behind Act (NCLB) reauthorized 21st CCLC in 2002, transferring the administration of the grants from the U.S. Department of Education to the state education agencies.  Each state receives funds based on its share of Title I funding for low-income students.  Funds are also allotted to outlying areas and the Bureau of Indian Affairs. The No Child Left Behind Act narrowed the focus of 21st CCLC from a community learning center model, where all members of the community benefited from access to school resources such as teachers, computer labs, gymnasiums and classrooms, to an afterschool program model that provides services only to students attending high-poverty, low-performing schools.  The services they provide include Academic enrichment activities that can help students meet state and local achievement standards.  They also provide additional services designed to reinforce and complement the regular academic program, such as: drug and violence prevention programs, counseling programs, art, music, and recreation programs, technology education programs, and character education programs.  Programs also may provide literacy and related educational development services to the families of children who are served in the program.

21st century in fiction: Many science fiction works have been set in the 21st century (years 2001 to 2100).  With humanity now in the 21st century, many of the predictions of these works have so far been proven obsolete.  This page lists only "predictions" regarding the 21st century, as opposed to contemporary accounts of the actual 21st century, which would be too numerous to list.

2013 Porsche Supercup: The 2013 Porsche Mobil 1 Supercup season was the 21st Porsche Supercup season.  It began on 12 May on Circuit de Catalunya and finished on 3 November at Yas Marina Circuit, after nine races, all of which were support events for the 2013 Formula One season.  A new car was introduced for the season as the Porsche 991 – the internal designation for the seventh-generation Porsche 911 – replaced the Porsche 997.

Porsche Cayenne: The Porsche Cayenne (Type 9PA [Designated 955 in online forums, not recognized by Porsche Cars AG]) is a mid-size luxury crossover sport utility vehicle produced by the German manufacturer Porsche since 2002, with North American sales beginning in 2003.  It is the first V8-engined vehicle built by Porsche since 1995, when the Porsche 928 was discontinued.  It is also Porsche's first off road Varient sports car since its Super and Junior tractors of 1950s, and the first Porsche with four doors.  Since 2008, all engines have featured direct injection technology.

Porsche 928: The Porsche 928 is a luxurious grand tourer produced by Porsche AG of Germany from 1978 to 1995.  Originally intended to replace the company's well-known and famed 911, the 928 combined the power, poise, and handling of a sports car with the refinement, comfort, and equipment of a luxurious saloon to create what some Porsche executives thought would be a vehicle with wider appeal than the compact, quirky and sometimes difficult 911.

Supporting paragraphs: Porsche Cayenne Porsche 928
Answer: since 1995, when the Porsche 928 was discontinued.