Billet 13B FD RX-7 Blows Rear Off The Starting Line Crashes Drag & Track by turboandstance - January 23, 2019March 3, 2019 This thing must make some big power with a Billet PAC 13B and a large single turbo, because it blew the rear diff instantly….. locking it up. Watch the video below and leave a comment or share this one with your friends. Follow us also on Facebook! Leave a comment