??? you don't know what's the purpose of using GT1 and you're planning to buy one? It's a very expensive tool if it's not aftermarket. For aftermarket GT1 (Chinese made and ship from China) it's <=$500 on eBay. Good luck.

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BMW X5 2004 - 2005 MB E320
BMW 1999 528i/ 1998 Nissan PathFinder (sold)