I have been debating over getting the walnut blasting done to get rid of the Carbon deposits and decided to give this product a try first. The Subaru boxer engine is know for its carbon deposits and this product is used at every service interval to keep things clean. It is a similar product to Seafoam but has a couple different additives in it.
This is the product here,
http://www.subaruforester.org/vbulle...leaner-124771/
I used a can of this and sprayed it into the Brake Booster vacuum line according to the instructions. I didn't blow out as much white smoke as I thought I would but holy cow, the results so far have been amazing! The car is running better than it ever has before since using this and I have had it for three years! Throttle response is greatly improved and no turbo lag at all when going through the gears.
I am absolutely blown away by the difference this made!