I made a short video over the weekend illustrating how to quickly and properly SeaFoam a WRX boxer engine. This may be useful for many new members coming over asking what the 'seafoaming' is.
I used 1/4 can the weekend before, 1/2 in the tank, and the remaining 1/4 can last weekend. It made a very noticeable difference. The engine has a very smooth feel to it now.
YouTube - How to SeaFoam - Subaru Impreza WRX