Porsche 911 997 GT3 Brpower amplifier! The BKV comes from a Porsche 911 GT3 built: 2011. Good used condition, not damaged, fully functional. Porsche Part number: 997.355.025.90 / 997.355.923.90 Original price: approx. We are happy to answer any questions by phone or email. Collection possible after making an appointment.