People need to understand the sheer depth of "professional mappers" they speak to - many use a re-seller file from either their software manufacturer or their suppliers and these bigger companies or dyno operators often don't have the time to specialize in one particular ecu unless you pay for it - even I would pass one of the older Motronic 12V ecu's over to Vince if I didn't have weeks or months to reverse engineer one myself or someone didn't want to pay for a complete custom job on their stock ecu, simply because he has done that many so I know has various boost files ready etc.
Also,