Without exaggeration, Impreza STI Cosworth can shame supercars several hundred thousand euros. It should be noted that this model can only catch 100 km / h in just 3.7 seconds, ie 1.5 seconds faster than the standard STI. The secret lies in the ability of the Cosworth still removing the versatile 99 hp 2.5-liter boxer, now totaling 395 hp.Mainly engineers Cosworth turbo unit have changed evacuation and replaced with a specially developed from a Garrett. It was also fitted another pump pistons oil and shirt were optimized to improve the friction of the engine. Most importantly they will not find aftermarket parts, so those who want the same performance you have to buy the original product.