Cobb Stage 1+ Power Package with V3 Accessport — Black SF Intake — 2015-2018 Subaru STI
The Cobb Stage 1+ Power Package with V3 Accessport for the 2015-2018 Subaru STI bundles the Accessport V3 with the Cobb SF Black Intake System. The Accessport provides EJ257-specific OTS calibration, and the SF black intake improves airflow over the factory airbox — both validated together as a Stage 1+ system.
DETAILS
- Includes: Cobb Accessport V3 + Cobb SF Black Intake
- Platform: 2015-2018 Subaru WRX STI EJ257 MT
- SF Intake: cone filter, aluminum tube, black coupler
- OTS maps for EJ257 with SF intake — 91 octane, 93 octane, E85
- Accessport live gauges and data logging
- NOTE: Ships via UPS/FedEx — signature required at delivery
EJ257 Stage 1+ on the 2015-2018 STI
The 2015-2018 GR/VA STI with EJ257 responds to Stage 1+ with the same improvements Cobb builds have delivered on this platform across multiple generations — improved mid-range responsiveness, more confident boost delivery, and sharper throttle response from off-throttle. The SF intake provides greater airflow improvement than a drop-in filter alone, and the Accessport OTS map is calibrated specifically for the SF intake configuration on the EJ257. Both components work together as a validated system rather than being independently sourced modifications.
SF Intake, Data Logging, and Building for Stage 2
The Accessport’s data logging captures EJ257 boost, AFR, IAT, and other parameters at high speed for ProTuner review — essential for 2015-2018 STI owners who plan to progress beyond Stage 1+. The SF intake installed here carries forward directly into NexGen Stage 2 hardware without replacement. The black coupler keeps the engine bay appearance clean and deliberate — performance hardware that does not announce itself visually.
What’s in the Box
- Cobb Accessport V3
- Cobb SF Black Intake
- OBD-II cable
- USB cable
- 2 faceplates
- Universal mount
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
Stage 1+ for the 2015-2018 STI is the correct foundation before NexGen Stage 2. The Accessport handles calibration for both Stage 1+ and Stage 2 as the build progresses. Building this stage correctly — with the right intake and the right calibration — means the Stage 2 upgrade is an incremental improvement rather than starting over.
Fitment
| Year | Make | Model | Notes |
|---|---|---|---|
| 2015-2018 | Subaru | WRX STI | EJ257 MT |
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