Wanting to replace his 515-horsepower "MADBUL" RX-7 and its twin-turbocharged, three-rotor 20B engine, his new ride is an NC-series Miata with four rotors and twin Garrett turbochargers courtesy ...

Three years later, after a complete engine rebuild, considerable dyno time, and various tweaks and changes, the four-rotor, AWD RX-7 is fully ... length 4-1 to 2 de-merge collector turbo manifold ...