Just to revisit this...you should read the directions before installing and using these harnesses.
When you adjust the harnesses, you have to tighten the lap belt first so it is tight and goes over your hips and the buckle is low in your gut. THEN tighten the shoulder straps. The buckle should still be low in your gut. Its usually right on my waist line. For those old fashioned people...below your belly button. If you have the buckle higher than that, its no good. First, it defeats the anti-submarine technology. Second, you'll look like a dork and people will laugh at you.
The schroth instructions shows pictures of how the harness should look.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red