Injen 18-21 Subaru WRX STI H4 2.5L Turbo SP Aluminum Series Cold Air Intake - Polished

The SP series of cold air intakes is Injen's flagship system in their lines of traditional aluminum cold air intake systems. Injen Technology is the world's first tuned air intake system and holds four (4) patents on the tuning process of an intake system, something no other manufacturer can claim. The SP series of cold air intakes feature many of Injen Technology's patented tuning process, including MegaRam (MR) Technology (Patents 7,359,795 and 7,669,571), Air Fusion (Patent 7,721,669), and many other innovations that keep Injen Technology at the forefront in the performance aftermarket.

Additional Information

SP Aluminum Series Short Ram Air Intake System, Part No. SP1208P, 2018-2021 Subaru WRX STI H4-2.5L Turbo

Part Type

Engine Short Ram Air Intake

Product Overview

Injen Technology has done it once again with this new short ram air intake for the 2018-2021 Subaru WRX STI Equipped with the H4-2.5L Turbo Engine. The Injen Technology SP1208 performance air intake system is the result of countless hours invested in research and development to provide a proven intake system designed to add power and performance to your STI. The Injen Technology SP1208 intake system is a direct replacement for that restrictive factory airbox and provides a engineered solution that allows that turbo to breathe deeply and produce it's full power potential with a simple drop-in install. To top it all off, no tune is required to get the power numbers noted!

• Aggressive engine tone under full throttle
• Available in multiple finishes
• Dyno Proven gains of up to 26 hp and 24 lb-ft. of torque
• Features Injen's patented MegaRam (MR) Technology
• Fully serviceable Injen SuperNano-Web dry air filter
• Huge 3.250in mandrel-bent 6061-T6 aluminum intake tubing
• Includes custom heat shield specifically designed for this application
• Injen Technology Limited Lifetime Warranty
• Injen's MR Technology provides massive power gains while maintaining A/F ratios
• Made in Pomona California, USA
• No additional tuning required and no check engine lights
• Note: This product is not currently CARB exempt and is not available for purchase in California or for use on any vehicle registered with the California Department of Motor Vehicles.
• Optional Hydroshield part number 1040BLK
• Replacement air filter part number X-1059-BB
• Short Ram Air Intake Design
• Smooth intake piping eliminates restrictions and improves airflow
• SP1208P (Polished)
• SP1208WB (Wrinkle Black)
• SP1208WR (Wrinkle Red)

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Product Details

Product Downloads

#	Document Type	Download
1.	Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Reference Information

Air Intake, SP Series, Polished Tube, Blue Filter, Dry Filter, Subaru, WRX STI, Kit

Injen SP Series Speed Pro Short Ram intake systems are designed for enthusiasts who demand the very best! These intakes reach down below your front bumper for colder, denser, fresher air—causing stronger, more efficient combustion. They're more than just a cold air conduit; the Speed Pro is a high-tech, fine-tuned oxygen delivery system. The intakes are perfectly designed to fit inside your exact year, make, and model with their TIG-welded brackets and high-quality aluminum tubing, making for a longer lifespan. Injen SP Series systems have unique rubber vibra-mounts, stainless steel clamps, and silicone hoses for a secure, hassle-free installation. Enjoy more horsepower and better acceleration with the value-packed intake fitted for your application.