Cobb Stage 1 SF Power Package 2015-2021 Subaru WRX

The Cobb Stage 1 SF Power Package for the 2015-2021 Subaru WRX combines the Cobb Accessport V3 with the Cobb SF Intake System a short-ram performance intake that replaces the factory airbox entirely with a free-flowing cone filter and polished aluminum intake tube. The SF intake improves airflow more substantially than a drop-in filter alone, and the Accessport OTS map is calibrated specifically for the SF intake’s airflow characteristics rather than adapted from a stock-intake configuration.

DETAILS

• Includes: Cobb Accessport V3 + Cobb SF Intake System
• Platform: 2015-2021 Subaru WRX FA20DIT MT and CVT
• SF Intake: replaces factory airbox with cone filter and aluminum tube MAF sensor retained in factory location
• OTS maps: 91 octane, 93 octane, E30, E85 calibrated specifically for SF intake configuration
• Improved throttle response, boost delivery, and mid-range power vs drop-in filter alone
• Accessport live gauges: up to 6 parameters on 2.8-inch color screen
• Accessport data logging for ProTuner custom calibration
• NOTE: Ships via UPS/FedEx signature required at delivery

SF Intake vs Drop-In Filter: What the Difference Actually Means

The SF intake moves beyond what a drop-in filter can achieve by replacing the factory airbox with a larger cone filter element and a smooth aluminum intake tube. The cone filter surface area is significantly larger than the OEM panel filter, providing improved airflow capacity that the FA20DIT’s turbocharger can take advantage of. The aluminum tube eliminates the bends and diameter changes in the factory intake path between the filter and the turbocharger inlet. Crucially, the MAF sensor is retained in its factory location within the SF intake tube the calibration remains able to accurately measure air mass entering the engine rather than relying on estimation. Cobb’s OTS maps for the SF intake configuration are not adapted from the stock-intake map with a filter change noted; they are developed for the SF intake’s specific airflow characteristics, calibrated to the actual improved flow that the SF provides. The result is calibration and airflow working together as a matched system.

FA20DIT Response, Accessport Gauges, and the Stage 2 Foundation

The FA20DIT responds to the combination of improved airflow and optimized calibration with a noticeably different character than a stock or drop-in-filter WRX. Throttle response becomes more immediate from low RPM as the turbocharger has easier access to its needed airflow. The boost curve builds more aggressively through the mid-range. And the power delivery above boost threshold feels more linear and committed through the rest of the rev range. The Accessport’s live gauge display monitors all of this in real time boost, AFR, IAT, coolant temp, throttle position, and other parameters while the data logging function captures everything at high speed for ProTuner review.

What’s in the Box

• Cobb Accessport V3
• Cobb SF Intake System (cone filter, aluminum tube, couplers, all hardware)
• OBD-II cable
• USB cable
• 2 faceplates
• Universal mount
• OTS maps pre-loaded

Why Choose Cobb Tuning

Cobb Tuning has been developing performance software and hardware for turbocharged enthusiast vehicles since 1999. Founded in Austin, Texas, Cobb built its reputation on the Accessport and expanded into a full catalog of hardware engineered to complement it. Every OTS map is developed in-house on real vehicles, and every hardware product is validated as part of a complete system not sourced and sold in isolation. That integrated approach is why Cobb produces consistent, reliable results across the builds we see every day.

The RallySport Take

The Stage 1 SF Power Package is the correct foundation for the NexGen Stage 2 upgrade path. The SF intake installed at Stage 1 carries forward directly into Stage 2 it is not replaced when NexGen Stage 2 hardware is added, but becomes part of the complete Stage 2 intake system. Building Stage 1 correctly with the SF intake means Stage 2 is a clean, incremental upgrade rather than starting over from scratch.

Fitment