Injen's RD1560BLK is a black RD Series cold air intake for the 1999–2000 Honda Civic Si, which uses the 1.6-liter DOHC VTEC four-cylinder. It replaces the factory airbox and resonator with a mandrel-bent 6061-T6 aluminum tube that pulls air from behind the front bumper, where the air is cooler and denser. The design aims to add mid-range pull and a sharper intake note under throttle while keeping air/fuel ratios in a safe range without a dedicated tune.
Compared with a budget filter-and-tube kit, the RD system is a complete, serviceable package built around a SuperNano-Web dry filter (replacement X-1013-BB) that can be cleaned and reused. California and other CARB-state buyers should note the system carries CARB Executive Order D-476-3, which is the documentation that matters for emissions-compliant use. A 1033BLK hydroshield is available for wet-weather driving, and the kit carries a limited lifetime warranty. Searches like "EM1 B16A2 cold air intake," "99-00 Civic Si CAI CARB legal," and "Injen RD intake no tune" tend to point to exactly this application.
This RD1560BLK is listed for the 1999–2000 Civic Si coupe with the 1.6L DOHC engine. Owners on user forums note that some aftermarket intakes for these cars are shared between trims, while name-brand systems are often calibrated for a specific engine. Confirm fitment with the manufacturer before ordering for any other trim.
The system carries CARB Executive Order D-476-3. Check the number on the product packaging or in the CARB database before installing it in California or any other CARB-state area.
The system is designed to keep air/fuel ratios safe without additional tuning, but I could not confirm a horsepower or torque figure from the manufacturer. Owners on user forums report that removing the stock resonator makes the car noticeably louder and that gains vary from car to car, so expect a change in sound more than a dramatic power jump.
This is a bolt-on job for a home mechanic, but it takes longer than a drop-in filter. Owners on user forums say the main task is removing the stock resonator box, which is what keeps the stock intake quiet, and that a true cold-air setup needs the tube routed through a hole in the front fender well. Some owners remove the front bumper to access the resonator mounts. The Si's OBD2 intake housing has a hole for the intake air temperature sensor, and owners warn that the sensor must be moved or reconnected properly, or the check engine light can come on. Mounting hardware and written instructions come with the kit. Plan for a full evening and set aside time to check every clamp and coupler for leaks before starting the engine.
