Best WRX Performance Upgrades
The upgrades that actually add power and drivability to a Subaru WRX — ECU tuning, intake, downpipe, and exhaust, ranked by bang for the buck.
Not every “performance” part is worth the money on a WRX, and doing things in the wrong order can leave power on the table — or hurt reliability. These are the upgrades that reliably improve how the car drives, ranked by value. For used, OEM, and hard-to-find versions, use the eBay Motors buttons at the bottom; for new parts, follow the category links.
1. ECU tune (Accessport)
A quality tune is the single biggest improvement in throttle response, boost delivery, and usable power on a turbo WRX — and it’s what safely unlocks every other bolt-on. A device like the COBB Accessport also lets you run off-the-shelf or custom maps as you add hardware. Start here, and re-tune whenever you change intake, downpipe, or exhaust. Browse engine & performance parts.
2. Cold air intake
A cold air intake improves airflow and adds that signature turbo intake and blow-off whoosh. On its own the gains are modest, but paired with a supporting tune it helps the engine breathe. Choose a quality filter and confirm the tune supports your intake (MAF-scaled setups are sensitive to intake changes).
3. Downpipe + cat-back exhaust
The exhaust side is where turbo WRXs make real, felt gains. A high-flow or catless downpipe reduces backpressure and spools the turbo harder (run it only on a proper tune), and a cat-back frees flow and delivers the boxer’s distinctive burble. Choose the sound level carefully — some systems drone at highway speed.
4. Turbo & boost hardware
Once the bolt-ons are done, turbo and boost upgrades — a bigger intercooler, upgraded charge pipes, or eventually a larger turbo — are how you make and hold more power. This is where power builds get serious, so plan fueling and tuning to match.
5. Brakes, suspension, and tires
Adding power is only half the equation. Upgraded brakes, a sorted suspension, and the right tires matter just as much once you’re driving harder — see our brake and suspension guides.
Start with a tune and an intake for the best value, then add a downpipe, exhaust, and boost hardware — re-tuning at each step.
Find these parts on eBay Motors
For used, OEM, and hard-to-find versions of these parts, eBay Motors is the marketplace — these open live listings for each one. Prices are set by the seller.