Version L and later can be identified by pumping the brake pedal fast - 20 times within 8 seconds while the ignition is on (not running).

The oil gauge needle will sweep after the 20th pump.

This also resets the ECU somehow and it has to 'learn' your driving style again. It may produce less miles per gallon during the learning phase (maybe one tank).

-Peter

ECU Version?
 

Hello all~
I just bought RX-8 and joined this club...
I was reading some articles here and found out that there are different versions for ECU and the latest one is 'M' version...
How can you check my car's ECU version?
My vin number is JM1FE17N340127494...
If it is not 'M' version... What should i do?
Thanks guys.

If you just bought it, it should be updated to the "M". You can always have your dealer check when you take it in for first oil change.

hm, looks like my answer up there posted before the question by DucatiX was postet, LOL

Also, it isn't "ECU" version, it's "flash version". Just a data file held in the PCM (Mazda's and international name for what many call the ECU).