Designed to separate the vapour from your engines breather system into air and oil, a Mishimoto Catch Can is a great addition to a heavily boosted engine.Normally this air is recirculated back into your engines inlet system which can lead to fouling of inlet components and the turbo, particularly on heavily boosted engines where a lot of blow-by occurs.Replacing this system with a catch can means you instead collect the carbon by-products in a can for later disposal.There is a sight glass for checking how full the can is. Large cans are 16cm in height and 8.89cm in diameter. 900cc capacity.Small cans are 15.75cm in height and 6.35cm in diameter. 480cc capacity.