SP3
An attempt to resolve SP's main problem, lack of engine power, was called "SP3 project". It would be basically an SP2, but with a 1.8L EA-827 (AP in Brazil) engine, watercooled, 8,5:1, 100 cv SAE at 6000 rpm and twin carburetors, all "borrowed" from the Brazilian version of the Passat TS. Although nothing came of the factory project, a prototype was made by Dacon who also offered a (prohibitively expensive) conversion kit.
Read more about this topic: Volkswagen SP2