"But, again, it must be there and all intake air must pass through it."


I don't agree with this statement, the rule clearly says that air intake hoses located ahead of the throttle body may be removed or substituted. Nothing says that all air must pass through the air mass meter. Even in vehicles using the air mass meter it would be legal to let extra air into the system after the air mass meter as long as it is before the throttle body.

I realize that this was not the intent when all this was discussed on this forum but that is what the rule says.

I think the wording about being "operational" is very confusing and should be changed. I also think that an air temperature sensor should be specifically allowed to permit conversion to a MAP system.

Nat Wentworth
ITB Volvo 142