I'm sure you're right. The speakers wouldn't move when under hard cornering or braking, so that was good enough for me. I'm one of those personalities that doesn't really consider crash testing. Quarter-mile times is more my kind of test.But I did bolt-in some one π's in a car one time. I removed the midwoofers, drilled mounting holes, bolted them in place, and then reinstalled the midwoofers. That was the best sounding car system I ever had. The speakers were PiAlign'ed JBL 2115s with KSN1038s above 10kHz. They were driven by Alpine amps and a Concorde front end. Sweet! And everything was nicely bolted down.