So how do they remap without the accuracy of a Dyno? Handing you back something you have no idea what the old or new output is..Oh I forgot VW software is renowned for being 100% accurate....Especially on their Diesels...I wouldn’t want my van remapped unless it was software from the manufacturer. I imagine the test facilities and design knowledge that VW designers have are not available to professional re-mappers. They may be able to increase the power but they don’t know the manufacturers constraints or design margins, so they cannot know the impact on component life time.