I just did this on Wed. and it was too easy. I used Valvoline's brand because I couldn't find STP or Seafoam, but I'm sure it's all close to the same. It felt awesome seeing all that black smoke and gunk come out the exhaust. Acceleration seems a lot smoother now and the pedal doesn't stick at all, even though it wasnt bad before. I'm going to clean my EGR ports soon also soon, hope its as easy as this was. I reccomend cleaning all yours out there too. It's too simple, and helps a lot.