What eliminates the problem completely is meth injection kit... that would always wash your intake valves clean like fuel in port injection engines. And if you are into tuning would increase power aswell. So that would be the end-all solution for the carbon buildup problem.
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2009 35i DCT Havana brown with ivory white interior. Mods: Cobb stage 1+FMIC, Wagner EVO1 FMIC, BMS DCI, KW V3 suspension, M3 front control arms, Hardrace RTAB, Michelin Pilot Sport 4S tires.
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