 In 1975 a new category, All American Grand Touring (AAGT), was introduced to counteract the Porsche dominance in GTO.In 1981, the Bob Sharp Racing team used a loophole in the rules to build a Datsun 280ZX inside the U.S. with a V8 engine from a Nissan President.The car was not a success, however, and it became obsolete when the new GTP category was created.