Racing Beat Power Pulse RX-7 Exhaust System 86-92 RX-7 (All Models) 16418This part is on backorder. Priority Pre Order this part to ship as soon as available. Estimated availability: 03 01 22. The Racing Beat street legal, Power Pulse cat back RX 7 exhaust system is the perfect replacement for your RX 7 exhaust a durable assembly offering a real horsepower gain over your stock unit. If you need to retain the emissions status of your RX 7 and keep the sound level to a tolerable level look no further than this Racing Beat