Notice X5M isn't listed under the applications
Do you have the Burger box on an X5/6M? I don't know one X5/6M running it, the one guy I talked to that had one said it had issues and Terry refunded him because he had no interest in further development. Further evidence at the top of the page he has the note "Fits MOST N63/S63 engines"
X5M, Eisenmann exhaust, 22" HRE wheels, catless down pipes, Stage II tune/X5 Diesel, Lowered & Tuned