a mail order tune is a basic tune that alters fuel, ignition & timing to gain more power and torque. tuners have developed thier own versions of the 1 base tune and can apply it too all who want it in as quick as 10 mins by re-flashing the engine cpu. it is different from a custom tune as this is tuned for each vehicle on a dyno to have it 100% accurate and will include trans shift points & abuse modes etc:w00t:.
when tuned you can simply dis-connect the maf sensor or if you install an otrcai or larger intake pipe it can be removed altogether
brad from Enhanced Automotive has a deal going this weekend - mail order tunes for $300 and this from personal experience is a killer tune. i believe he has posted details of this in the sponsors section:thumbsup:
click this link for more details
http://forums.justcommodores.com.au/enhanced-automotive/69236-300-mafless-mailorder-special.html
hope that helps you out some