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Message: [QUOTE="footlong70, post: 1205397, member: 8456"] I'll have to agree to disagree. I'm not sure we're on the same page here but the MAF is JUST measuring air passing the sensor as you said. Turbos and plumbing changes after the sensor does not need maf scaling. The sensor is just going to see more or less air passing it based on what you changed behind it like you should. So for example installing some new massive compounds that is going to pull tons more air than stock is going to do just that. Pull more air in which the sensor will see as its suppose to. It's see more air passing so the pcm takes it from there. The part that gets skewed is a change in area in the plumbing at the maf itself. If the motor for example pulls in 100cfm in x amount of time of air in two senarios. One with the maf in a pipe at 4" and one in a pipe 5". Which scenario will have faster moving air even though the same total volume is being moved in the same amount of time. The 4" obviously. So when you have a maf/pcm scaled to read in a 4" pipe, then change just the piping size to 5" without adjusting the maf map, the sensor is going to see a velocity drop with the same 100 cfm. Translating into a lower gram/hour as far as the pcm is concerned even though it's not true. The engine is still using the exact same volume of air but the maf/pcm is not seeing all of it. Just to clarify. I did not mean the larger intake changes the maf map or any of the tuning. It just not reading the correct values anymore. I've tuned NA motors that would not or barely run just from a 2.75" pipe to a 4" at the maf. Even a motor that would barely stay running with a 30 degree angled cone filter that was pointed up instead of down, just because the filter threw air away from the maf thermocouples. It's definitely a useful sensor that should always be kept tuned for size of pipe it sits in. Sent from my iPhone using Tapatalk [/QUOTE]