Nissan 370Z Sway Bars: Whiteline vs Hotchkis vs Eibach

Nissan 370Z sway bars are the single most cost-effective way to fix the Z34's biggest chassis flaw: factory understeer. The 2009-2020 370Z rolls off the line with a 332-hp VQ37VHR 3.7L V6, rear-wheel drive, and a genuinely capable double-wishbone front / multi-link rear suspension — but soft, thin factory anti-roll bars leave it pushing wide at corner entry. Swap in a stiffer set and the same car turns in sharper, rotates on throttle, and holds a flatter, more predictable line. In this comparison we put the three sway bar setups NLP Performance stocks for the 370Z head-to-head: the Whiteline BNK014 kit, the Hotchkis 22441 set, and the Eibach Anti-Roll-Kit — plus the SPL spherical end links that make any of them work better.

Why Does the Nissan 370Z Understeer From the Factory?

The 370Z understeers because Nissan tuned its factory anti-roll bars soft for ride comfort and stability, biasing grip toward the rear. The Z34 platform is fundamentally well sorted — near 53/47 front-to-rear weight distribution, a rigid chassis, and a curb weight around 3,300 lb — so the limiting factor for most drivers on a canyon road or track day is chassis balance, not raw grip or power. A larger front bar and an adjustable rear bar let you rebalance roll stiffness front-to-rear, which is what actually kills understeer.

Sway bars (anti-roll bars) resist body roll by twisting as one wheel compresses relative to the other. Increase a bar's diameter or effective stiffness and you increase that end's share of roll resistance. Stiffen the rear relative to the front and the car rotates more freely — understeer turns to neutral, then to lift-off oversteer if you go too far. That is why the best 370Z upgrade is a matched front-and-rear kit with adjustment on tap, not a single bar bought in isolation.

The Three Best 370Z Sway Bar Setups Compared

All three kits below bolt to the same factory mounting points on a 2009-2020 370Z (Z34) and its Infiniti G37 platform-mate, and all three raise roll stiffness well beyond stock. Where they differ is bar diameter, how much adjustment you get, and price. Here is the quick side-by-side, followed by a deeper look at each.

1. Whiteline BNK014 Front & Rear Sway Bar Kit — Best Overall

The Whiteline BNK014 is our top pick because it is the only kit here that combines a matched front-and-rear bar set with per-end adjustment and the adjustable ball-end links needed to preload the bars correctly. The 27mm tubular front bar offers 2 stiffness positions, the 24mm tubular rear bar offers 3, and swapping the rear to its stiffest hole is the classic move to rotate a base 370Z. Whiteline backs it with a lifetime warranty.

2. Hotchkis 22441 Sport Sway Bar Set — Best Set-and-Forget Balance

The Hotchkis 22441 is a matched front-and-rear sport sway bar set engineered to turn the 370Z's factory understeer into "comfortably neutral" handling straight out of the box. Hotchkis designs its bars to add front and rear roll stiffness in a fixed, proven ratio, so you get crisp turn-in and the ability to steer with throttle without spending an afternoon testing adjustment holes. It is the pick for a street or autocross Z where you want the result without the tuning homework.

3. Eibach Anti-Roll-Kit (32mm Front / 29mm Rear) — Biggest Bars, Best Value

Eibach's 6393 Anti-Roll-Kit uses the largest-diameter bars in this test — a 32mm front and 29mm rear — and sells them separately so you can start with the front for maximum grip and add the rear when you want rotation. At $299 for the front and $269 for the rear ($568 as a pair), it is the most affordable way into a serious 370Z handling upgrade, and Eibach backs its bars with a million-mile warranty. The front bar alone fits 2009-2020 370Z models, including the 370Z Nismo and 40th Anniversary Edition.

Want the matching rear? Add the Eibach 29mm Rear Anti-Roll-Kit ($269) to complete the front-and-rear pair and unlock rotation on corner exit.

Don't Forget the End Links

Upgraded sway bars put more load through the end links, and the factory 370Z links have rubber bushings that flex and bind — robbing your new bar of response and wearing out. Adjustable, spherical-bearing end links fix that. The SPL Parts front sway bar end links use chromoly bodies and PTFE-lined spherical bearings for bind-free articulation, and their adjustable length lets you set correct bar preload after lowering the car. On a Z34 running any of the bars above, quality end links are the difference between a bar that feels sharp and one that feels vague.

Which 370Z Sway Bar Setup Should You Buy?

Choose based on how much you want to tune. If you want the widest adjustment range and the ability to dial in exactly how much the car rotates, buy the Whiteline BNK014 — it is the most complete kit and our top pick. If you want a proven, near-neutral balance with no trial-and-error, the Hotchkis 22441 set is the easiest path to a better-handling Z. And if you are on a budget or want the biggest bars for the money, start with the Eibach 32mm front and add the 29mm rear later. Whatever you choose, budget for a set of SPL adjustable end links — they let the bar do its job.

At NLP Performance in Tampa, FL, our customers running a staggered square or wider aftermarket wheel-and-tire package consistently report the biggest gains from a rear-biased sway bar setup, since it counteracts the extra front grip and keeps the Z rotating. Sway bars also stack perfectly with coilovers or lowering springs — do the bars first if handling balance is your priority, since they change the car's character more than ride height alone.