Questions from a newbie, had read alot about the FD.

[Nobbie]

On my LET enigne in my current car i have an Air Mass Meter, this meters the air into the engine, and reports it to the ECU, the ECU then works out the fueling on the pre-set map, and fuels accoringly. So if its has a std air filter on it\'ll fuel for the amount of air its getting, if i put an induction kit and cold air feed on it, the ECU gets different values, and runs a different fuelling set-up.
I can\'t seem to see an AMM on the RX7\'s, so what do you guys do when you add an induction kit, and exhaust? Does the Std ECU re-calculate, or do you have to manually up the fuel pressure, or just get a mappable ECU, and then map with every new mod??