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In page Porsche 928:

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Porsche's Racing Department never officially entered or prepared a racing 928 for a pure works entry. Porsche did arrange for the creation of a 928 GTR, to compete against the then-dominant 911 (993 GTR) on the race track. In order not to offend the sensibilities of their traditional 911 customers by openly challenging them with a works offering, Porsche asked Max Moritz Racing, their longtime private racing partner from nearby Reutlingen to enter a 928GTR Cup as a 'semi-works' car.[citation needed]