Euro anyday. Cooler looks THAN MAZDA n much more parts developed for the K20A by companies in US n Japan. My buddy Gary drives a K20A powered Civic Dragcar. U guys might hav seen it in sum magazines. The engine is completely stock n runs 12.43sec 1/4 mile. Hondas hav way more potential than Mazda in this sense. I'm pretty neutral n unbiased about cars. Mazda 6 is nice but i guess it sorta lack the oomph* The front grille isnt up to my taste but it still comes down to personal preference. My advice, go for a test drive in both but u wont regret getting a Euro.