Jb4 told me that their tune left marks even if its removed... so dobt be silly mike plis
Every tune will left information in your datalogs that the cars was tuned... its important to clear all logs before visit in bmw. Ots easy but U have to have good guy who will do it for U. It doesnt metter if it is box or proper tune, bm3 or jb4, dinan it will left marks.