VIDEO: 1985 Mazda RX-7 Custom Airbox Installation Part 3 January 13, 2018 | No Comments In the 3rd and last part of this series, I run the ducting for the air box, test fit it into the car, get it painted, and then install it in the car with a filter. Builds, Videos | Tags: 13B, air box, airbox, cai, cold air intake, mazda, peripheral port, rotary engine, rx7, short ram