If you're looking to boost the performance of your 2003-2004 Mazda Protege Mazdaspeed I4-2.0L Turbo, the Injen RD6066BLK Cold Air Intake is a smart upgrade. Designed with precision and engineered for efficiency, this cold air intake (CAI) not only enhances horsepower but also elevates the aesthetics of your engine bay.
The Injen team has rigorously tested this intake system to ensure it delivers real-world performance improvements. With dyno-proven gains of up to 14 horsepower and 14 lb-ft of torque, you'll feel the difference as soon as you hit the throttle. What's more, the intake maintains safe air-fuel (A/F) ratios throughout the powerband without requiring additional tuning, making it a straightforward installation for any DIY enthusiast.
The heart of the RD6066BLK is its mandrel-bent 6061-T6 aluminum tubing, designed to provide a smooth, uninterrupted airflow path. This means cooler, denser air is directed straight to your engine, maximizing efficiency and performance. Coupled with the Injen SuperNano-Web dry air filter, this system allows for increased airflow and superior filtration, ensuring your engine breathes clean air.
Not only does the Injen RD6066BLK deliver power, but it also offers an aggressive, throaty engine tone that you can hear and feel. Whether you’re cruising down the street or pushing your car to its limits, this intake will make sure your presence is known.
Want to make your engine bay stand out? The RD6066BLK is available in both a polished and a laser black powder-coated finish, allowing you to choose the look that best matches your style.
This intake is specifically designed for the following models:
A Mazda Protege owner shared, "After installing the Injen RD6066BLK, my car feels more responsive, and the sound is incredible! It’s a must-have for anyone looking to enhance their ride without complicated tuning." This upgrade not only delivers performance but also gives your engine bay that polished, professional look.
Other Part Numbers:
Injen #injRD6066BLK
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Vehicle Make/Model | Year | Trims |
|---|---|---|
| Mazda Miata | 2004 | Base |
| Mazda Miata | 2004 | Mazdaspeed |
| Mazda Miata | 2004 | LS |
| Mazda Protege | 2003 | LX |
| Mazda Protege | 2003 | Mazdaspeed |
| Mazda Protege | 2003 | ES |
| Mazda Protege | 2003 | SE |
| Mazda Protege | 2003 | DX |
Injen is highly recognized in the automotive industry. The company started in 1991 and specializes in manufacturing high-quality air induction products. The company has become the go-to brand by multiple import tuners and has since become an automotive icon in the industry.
Years of ExperienceFor more than three decades, the company has created dozens of patents and thousands of new products. All of their products are dyno-tested to ensure that it provides optimum performance to the vehicle it is applied to.
Injen offers a variety of products ranging from intake systems, intercoolers, exhaust systems, and other performance parts. All their products are made out of high-quality materials and are designed by the industry’s top designers and engineers. This enables them to create products that are not only functional but adds an aesthetic value to the vehicle. Even up to now, the company never stops in improving its product. Hence, they are a favorite of tuners who wanted to have the best.
Purchase Injen Products at Vivid RacingIf you are looking for products that provide performance gains and are tried and tested, then Injen is the brand for you. They have been used by thousands of enthusiasts worldwide and have provided them high-performance products they truly deserve. The company has one of the most comprehensive lists of products that applies to most vehicles available in the market. You can never go wrong with Injen.
Visit Vivid Racing and check out their list of products that would fit your specific needs.

Injen Technology offers a Limited Lifetime Warranty to the original purchaser against defects in material and workmanship on all intake systems excluding the filter element. Injen Technology will replace at no charge, any intake pipe considered by Injen Technology to be defective. The warranty is void if the warranty card is not returned to Injen Technology within the first 30 days of purchase. Any and all warranty coverage is limited to the repair or replacement of the defective part only, at Injen Technology.s discretion. Proof of purchase is required. The warranty does not cover incidental or consequential damages, nor does it cover the cost of installation or removal of the defective part or its replacement.
EXHAUST WARRANTY
Injen Technology offers a one-year warranty to the original purchaser against defects in material and workmanship on all exhaust systems. Injen Technology will replace at no charge, any exhaust system considered by Injen Technology to be defective. Any and all warranty coverage is limited to the repair or replacement of the defective part only, at Injen Technology's discretion. Proof of purchase is required. The warranty does not cover incidental or consequential damages, nor does it cover the cost of installation or removal of the defective part or its replacement.
AIR INTAKES AND ACCESSORIES
Injen Technology offers a Limited Lifetime Warranty to the original purchaser against defects in material and workmanship on all intake systems excluding the filter element. Injen Technology will replace at no charge, any intake pipe considered by Injen Technology to be defective. The warranty is void if the warranty card is not returned to Injen Technology within the first 30 days of purchase. Any and all warranty coverage is limited to the repair or replacement of the defective part only, at Injen Technology's discretion. Proof of purchase is required. The warranty does not cover incidental or consequential damages, nor does it cover the cost of installation or removal of the defective part or its replacement. All warranty items must be sent freight prepaid with a valid RMA (Return Merchandise Authorization) number and copy of original invoice.
SES INTERCOOLERS AND EXHAUST SYSTEMS
Injen Technology offers a one-year warranty to the original purchaser against defects in material and workmanship on all exhaust systems. SES Intercooler and exhaust systems that have been installed will not be eligible for return under any circumstances. Defective parts will be replaced or repaired as deemed necessary by Injen Technology. All other warranty issues will apply as indicated under the Air Intake section. Most exhaust and Intercooler system installations may require a lift and or specialized tools. Due to the installation complexity of automotive exhaust and Intercooler systems, Injen Technology recommends that a qualified technician perform the installation. Most local Tuner or exhaust and muffler shops offer professional installation.