Best WRX Turbo & Bolt-On Upgrades

On a turbo car like the WRX, the biggest, most satisfying gains live in the intake and boost path. These upgrades make the WRX faster, more responsive, and better able to hold power — ranked by how much they matter. (Starting at the very front of that path? See our best cold air intakes for the WRX.) Use the eBay Motors buttons for used and OEM parts, and the category links for new gear. Everything that changes boost should be backed by a proper tune.

1. A supporting tune

Everything starts here. A quality ECU tune manages boost, fueling, and timing so your hardware makes power safely — and it’s the single biggest driver of how the car feels. Add it first, then re-tune as you bolt on the rest. See engine & performance.

2. Upgraded intercooler

The factory top-mount intercooler heat-soaks quickly under sustained boost. A larger top-mount or a front-mount intercooler keeps intake temps down, which means more consistent power on hot days and hard pulls. Our WRX intercooler guide (TMIC vs. FMIC) breaks down which one fits your build. Browse turbo & boost parts.

3. Downpipe

A high-flow or catless downpipe is the classic WRX power adder — it reduces backpressure and spools the turbo harder. Run it only on a supporting tune, and check emissions rules where you live, since many are off-road/track only. Adding the downpipe (with its own tune) is exactly what takes a WRX from Stage 1 to Stage 2 — our Stage 1 vs. Stage 2 guide explains what each stage includes and the build order. Pair it with a cat-back exhaust for the full effect — our WRX exhaust systems guide covers catted vs. catless downpipes and cat-back sound in depth.

4. Charge pipes and BOV

The factory plastic charge pipe is a known weak point under boost. An upgraded aluminum charge-pipe kit and a quality blow-off or bypass valve improve reliability and boost response — a relatively cheap, easy win in the forced-induction category.

5. Bigger turbo (when you’re ready)

Once the supporting mods are in, a larger turbo is how you make a real jump in power. This is a serious step that demands matched fueling, tuning, and monitoring — plan the whole package rather than bolting on a turbo alone. It’s also the point where the drivetrain, not the engine, becomes your limit: the clutch starts slipping and the base-WRX 5-speed reaches its ceiling. Sort that out with the WRX clutch & flywheel upgrade guide before you go chasing big boost.

Get the tune and intercooler right first — they’re the foundation — then add a downpipe, charge pipes, and eventually a turbo as your build goals grow.