Humphries Steel & Performance in Palmerston North, New Zealand is building a unique Mazda RX-7 FD for Mukka Motorsport. The company fabricated a custom roll cage, floor, and rear subframe to hold a Speedway Engineering quick-change independent rear end. Then the car went to Pulse Performance Race Engines (PPRE) for one of their naturally aspirated six-rotor motors mated to a HGT Precision six-speed sequential transmission.
Source: PPRE FB page