Best Sway Bars for 2015-2020 Subaru WRX: 4 Top Picks

The best sway bars for the 2015-2020 Subaru WRX attack the one thing the factory got conservative about: body roll. Subaru tuned the VA-chassis WRX to understeer and lean in hard corners so it stays predictable for everyone, but that soft calibration is exactly what enthusiasts want to sharpen. A stiffer anti-roll bar is the cheapest, fastest handling mod you can bolt to a WRX — no tune, no cutting, and it is reversible. At our Tampa, FL shop we fit more WRX sway bars than any other suspension part, and the four kits below cover every build from a daily-driven Premium to a track-day STI.

Why the 2015-2020 WRX Needs a Sway Bar Upgrade

A sway bar (anti-roll bar) is a spring that resists body roll by linking the left and right wheels, so the stiffer the bar, the flatter the car stays in a corner. The VA WRX leaves the factory with relatively thin bars and a safety-biased understeer balance — the nose pushes wide and the body leans before the chassis loads up. Because the WRX is a nose-heavy, all-wheel-drive car, that understeer is the first thing owners want gone.

Upgrading to a thicker bar flattens the car and tightens turn-in without the harsh ride penalty of stiffer springs. The aftermarket front bars here run 26mm versus the smaller factory piece, and the rear bars run 22-24mm, which is where the real balance change happens. Add a stiffer rear bar and the WRX rotates into corners instead of plowing — the single most-requested handling fix we hear from WRX owners. Best of all, every option on this list is a bolt-on that keeps your factory ride height and spring rates intact.

How We Chose These Sway Bars

We ranked these four kits on verified VA-chassis fitment, bar diameter, adjustability, finish and corrosion protection, warranty, and price. Every bar here is a confirmed bolt-on for the 2015-2020 WRX (STI-specific options are flagged clearly), ships with the hardware it needs, and sits in the $150-$570 range that WRX owners actually spend. We weighted adjustability heavily, because a tunable bar lets you dial the handling balance at the track without buying a different part.

The 4 Best Sway Bars for the 2015-2020 Subaru WRX

1. Whiteline 26mm Front Adjustable Sway Bar — Best Overall

The Whiteline BSF47Z is the sway bar we recommend to most 2015-2020 WRX owners. At 26mm it is noticeably thicker than the factory front bar, and the two-position blade ends let you choose a firmer or softer setting in minutes with a wrench. It is a direct bolt-on with no trimming, finishes in Whiteline’s signature corrosion-resistant coating, and carries a limited lifetime warranty. For around $233 it delivers the flattest, most confident turn-in per dollar of anything on this list.

2. BLOX Racing Front & Rear Sway Bar Set — Best Budget Pick

If you want both ends done for one low price, the BLOX Racing set is the value play. For under $300 you get a 26mm front bar and a 24mm rear bar — a matched pair that stiffens the whole car and, thanks to the bigger rear bar, cuts the WRX’s factory understeer. The bars are fixed-rate (not adjustable), which keeps the price down and the install simple. It is the cheapest way to upgrade front and rear together on the 2015-2020 WRX, and BLOX also sells the front (around $151) and rear (around $151) separately if you only want one end.

3. Eibach Anti-Roll Kit (Front & Rear) — Best Matched Upgrade

Eibach engineers its front and rear bars as a matched set, so you get a balanced handling change straight out of the box with no guesswork. The kit includes both bars plus the bushings and hardware, wears Eibach’s durable red powder-coat, and is backed by the brand’s Million Mile Warranty. At around $568 it is the premium choice for the 2.0L WRX owner who wants a dialed, set-and-forget upgrade rather than tuning blade settings at the track. Note this kit is for the 2.0L WRX and does not fit the STI.

4. SuperPro 26mm Front Adjustable Bar — Best for the WRX STI

The 2.5L WRX STI uses a different front bar than the 2.0L WRX, and this SuperPro 26mm bar is built specifically for it. It is a two-position adjustable bar with heavy-duty polyurethane-lined mounts, so STI owners get the same tunable, flat-cornering benefit as the Whiteline front bar on the standard WRX. At around $269 it is the pick we steer STI drivers toward when they want to attack factory understeer. Make sure you buy the STI-specific bar — the 2.0L WRX bars above will not clear the STI’s different front subframe.

2015-2020 Subaru WRX Sway Bars Compared

Here is how the four kits stack up on the specs that decide a WRX sway bar purchase — mounting position, bar diameter, whether it is adjustable, and price. All four are confirmed bolt-ons; the Whiteline and Eibach are 2.0L WRX fitments, the SuperPro is STI-specific, and the BLOX set spans 2015-2021.

Front vs Rear: Which Sway Bar Should You Upgrade First?

For a nose-heavy AWD car like the WRX, upgrading the rear sway bar first does the most to cut factory understeer. A stiffer rear bar increases how much the back of the car resists roll, which shifts grip balance rearward and lets the nose tuck into a corner instead of pushing wide. A stiffer front bar flattens the car and sharpens turn-in but, on its own, can add understeer — which is why many WRX owners pair a modest front bar with a bigger rear bar.

The simplest path to a balanced setup is a matched front-and-rear kit like the BLOX set or the Eibach Anti-Roll Kit, which are tuned to work together. If you prefer to tune the balance yourself, an adjustable bar such as the Whiteline front or the SuperPro STI front lets you firm up or soften each end at the track by moving the end link to a different hole. Start on the softer setting for the street, then stiffen as you chase rotation.

Installation & Tuning Tips

A WRX sway bar is a genuine bolt-on job you can do at home with hand tools in about 30 minutes per bar. The front bar swaps through the subframe area, and the rear bar unbolts from the brackets near the rear differential — no cutting, welding, or alignment required. We recommend greasing the polyurethane bushings on install to prevent squeaks, and torquing the bracket and end-link hardware to spec. If your bar is adjustable, start on the softest setting, drive it, then step up one hole at a time until the balance feels right. Because the swap is reversible, you can always return to stock for a trade-in.

Pair any of these bars with upgraded end links and fresh bushings for the crispest response, and consider a chassis brace if you track the car hard. Shopping other VA WRX handling parts? Browse our full Subaru WRX suspension collection for coilovers, springs, and end links that complement these sway bars.