Quote Originally Posted by Beran View Post
So - "Operational" seem to state that it has to be working/used?
Think of it this way.

A vehicle's MAF is typically the main intake restriction, especially those with a flapper-type system (e.g. Mk1 Miata). As such, the rule is written such that you cannot remove the MAF and increase the amount of airflow going into the engine.

But, the rule was written specifically to allow such systems as Megasquirt, Haltech, and "piggyback" ECUs, many of which use TPS and MAP as their primary engine load input.

Thus, one can meet this rule very easily: install a TPS and MAP if not so equipped (specifically allowed), and if you wish leave all the wiring stock - even the inputs into the wiring harness/ECU - and simply program your ECU to ignore the MAF signal. Since ECUs are free, including programming, is completely free, it's not only legal to the letter but also to the spirit and intent of the rule.

While you may find the wording of the rules a bit awkward, I ssure you this was the specific intent of them. - GA