ACF also raised the stakes for GD and Northrop because it brought in further competitors intent on securing the lucrative order that was touted at the time as "the arms deal of the century". These included the Dassault-Breguet Mirage F1 E (E for Europe) powered by a Snecma M53 engine and utilizing a fly-by-wire system similar to the one used in Dassault Mirage 2000 series. Only two prototypes were built for the ACF program, the Anglo-French SEPECAT Jaguar, and a proposed derivative of the Saab 37 Viggen named the Saab 37E Eurofighter (not to be confused with the later and unrelated Eurofighter Typhoon). Northrop also offered their earlier design, the P-530 Cobra, which looked very similar to its YF-17. The Jaguar and Cobra were dropped by the MFPG early on, leaving two European and the two U.S. LWF designs as candidates.