Hello CGM I am currently replacing knock sensors. taking the intake manifold off I have noticed that I have a shit ton or carbon on the intake manifold and the intake runners on the head. Its only in the runners. from what I can see behind the valves looks good. I have never sea foamed before cause I am too chicken shit. Im not that worried about the oil and fuel as much as I have used fuel treatment before and ran synth for the 3 years or so but I have never attempted to clean the intake of the motor. So just do et or is it really not that necessary. this is one of those subjects where its pretty evenly divided between yes and don't touch it lol. Thoughts? Its a 2000 so it has the EGR bullshit which is probably the cause of all the carbon in the first place