I sent an e-mail to the person responsible for US Hamann distribution about getting the X5M X6M engine tune. Here is his response.

"Unfortunately Hamann America is not importing any engine software at this time. Hamann engine software is currently optimised for 98 octane fuel and has not been tested on US spec vehicles. Are there any other parts you may be interested in?"

I heard from someone that 98 octane in Europe is like 91 US. Is this true?

Marc