I have remapped all my cars over the last 10 years, the only advice I would say is go for a reputable mapping company I’ve used superchips and never had an issue, they are not always the highest figures but do make sure your vehicle is drivable, I cover 100k miles with a remapped e46 330D and even when I sold it with 130k it still amazed me and pulled like a steam train. If driven normally still delivered 50+ mpg
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