But surely the Ecoboost isn't competitive in motorsports?
Actually in amateur motorsports like autocross, track days, etc. the Ecoboost slots into a "slower" class so it's just as competitive, and for track days nobody's racing anyway. The Ecoboost driver saves $10-20K in initial purchase price, needs a third less gas to get to the track, work, etc.. and the lighter "less" powerful Ecoboost is easier on tires. Throw in the Ecoboost's trailer towing ability and Ford's willingness to warranty it as long as you keep the engine stock and it's a worthy competitor for the Miata, Toyburu "twins", and GTI!