The worst one I've seen so far - Skyactiv D carbon build up : r/Justrolledintotheshop
Absolute Filth! Inlet manifold carbon buildup and cleaning. - French Car Forum
Carbon cleaning and intake manifold is nasty. Should this be replaced or just cleaned? Mk7 Golf R 125k miles : r/Volkswagen
The Benefits of Intake Cleaning
R56 Carbon Build Up Fixes, Catch Can, SeaFoam Etc.... - North American Motoring
Carbon build up in 1 of my intake runners - Honda-Tech - Honda Forum Discussion
Darkside Developments - Walnut Media Blasting / Carbon Cleaning
Diesel Carbon Cleaning | Core Diesel | Fraser Coast
Cleaning the carbon build up? Worth it? Details in comments : r/powerstroke
Carbon build up in Intake manifold.... - ProFix Garage Navan | Facebook
Carbon Deposits: What is Carbon Buildup and How To Prevent It
Intake Valve Carbon Cleaning – Paul's Motor Car Service
Intake manifold clean up | VW Vortex - Volkswagen Forum
VW/Volkswagen TDI Carbon Build-up/Black Smoke/Lack of Power/Poor Fuel Ecomomy - European Autowerks
Diesel Carbon Clean - Diesel Performance Tune
Carbon Build-Up Inspection | Point Pleasant, NJ | Island Sport Works
Diesel engine intake carbon build up issues - CAT Automotive
BMW & Mini Intake Valve & Port Walnut Blast Cleaning | Burch Motor Works
Carbon Intake Cleaning | Solo Motorsports
