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^ wut?
"why aren't the people claiming it is carbon build up using a cleaner in the air intake?"
Do you mean, "why aren't people (who think carbon is building up) using a cleaner in the air intake?"
I don't think it would have much affect. The stuff will get pretty caked onto the intake valves and a short burst of whatever you put in wont do much -- but it will confuse the shit out of the ECU and, if you don't spray it in enough downstream, can really mess with your MAF.
I know recently I saw a picture of a porsche (?) intake valve that looked quite nasty but can't find it. The buildup was attributed to DI.
As has been said before, the D4-S system that uses port and direct should amke this a complete nonissue, and make tuning much easier / power potential higher (pretty hard sometimes now because there aren't many replacement direct injectors).
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