My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

KYB Suspension 551131 Gas-a-Just Monotube Performance Shock Absorber

(2006-2015 Lexus IS250; 2006-2016 Lexus IS350; 2016 Lexus IS200t)

Part of: KYB Suspension Gas-a-Just Monotube Performance Shock Absorber

Other options in this family: KYB Suspension 551108 KYB Suspension KG4605A KYB Suspension 551119 KYB Suspension KG4503 KYB Suspension 551122

Manufacturer

Picture for manufacturer KYB Suspension

Part Number

551131
16 reviews
Sale Price

$149.16

In Stock (5)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The KYB Gas-a-Just 551131 is a high-performance monotube shock absorber engineered to deliver superior handling and fade-free performance. Unlike traditional twin-tube shocks, this monotube design provides instant response and automatic adjustment to changing road conditions without experiencing performance fade from aeration.

Key Features:

  • Monotube design with dual working chambers for optimal performance
  • Air-free hydraulic piston and valve area ensures responsive control and precise handling
  • High-pressure nitrogen gas chamber with floating piston technology
  • Fade-free performance that maintains consistency under demanding conditions
  • Automatically adjusts to performance needs in real-time
  • Provides comfortable ride quality during normal driving with instant performance on demand
  • Available as direct OE monotube replacement or performance upgrade over twin-tube designs

The Gas-a-Just 551131 separates hydraulic fluid from nitrogen gas using a floating piston, eliminating aeration and ensuring consistent damping performance. This advanced design makes it ideal for drivers seeking improved vehicle control, reduced body roll, and enhanced stability without sacrificing everyday ride comfort.

Products specifications

Fits

2006-2015 Lexus IS250; 2006-2016 Lexus IS350; 2016 Lexus IS200t

Upper Mount Type

12X1.25

Compressed Length

17.34

Extended Length

20.78

Stroke Length

3.44

Lower Mount Type

E2(14.2X42)

Feature and Benefit 7

ELECTRONIC SAFETY SYSTEMS DEPEND ON THE SUSPENSION, BRAKES AND TIRES OPERATING AS THE VEHICLE MANUFACTURER INTENDED. THE KYB GAS-A-JUST HELPS KEEP ELECTRONIC SAFETY SYSTEMS PERFORMING AS DESIGNED.

Feature and Benefit 5

FLUID LEAKING CAN BE A CAUSE OF SHOCK FAILURE, THE KYB GAS-A-JUST HAS AN ULTRA-SMOOTH TRIPLE CHROME PLATED CHROME PISTON ROD TO REDUCE SEAL WEAR

Feature and Benefit 3

GAS-A-JUST MONOTUBES ARE DESIGNED FOR VEHICLES THAT WORK, TOW, AND HAVE LARGER, HEAVIER TIRES & WHEELS

Feature and Benefit 4

HIGH PRESSURE MONOTUBE DESIGN SEPARATES THE GAS AND OIL FOR FADE FREE OPERATION AND INSTANT RESPONSE

Internal Rebound Spring

INTERNAL REBOUND SPRING

Dust Cover Included

N

B-stop

N

FEATURE AND BENEFIT 1

THE CORRECT, MONOTUBE-DESIGNED OEM REPLACEMENT

Feature and Benefit 6

THE HIGHER GAS PRESSURE OF THE KYB GAS-A-JUST RESPONDS QUICKLY TO IMPROVE STEERING RESPONSE

Feature and Benefit 2

THE KYB GAS-A-JUST HELPS RESTORE THE DESIGNED CONTROL AND HANDLING OF THE LEXUS IS

Feature and Benefit 8

TO REDUCE THE CHANCE OF NOISE AND VIBRATION KYB RECOMMENDS INSTALLING NEW STRUT MOUNTS, PART NUMBER: SM5642

R-stop

Y

Internal Rebound Spring

Y

Great price & Free shipping.

Was great and easy

Fast shipping, easy to navigate website, good price! Thank you.

item was better then expected packed well.

Easy to order!

Awesome place to shop. prices are great as well

Wish shipping was cheaper

good prices on quality product

Thanks for your help off eBay , directing me to your site ! #ebayfollowed

need to know estimated shipping date

very quick and easy.

good prices, well-designed website. stuff got here like lightning, nicely packaged. will def use again.

Went smoothly

Easy and straight to the point.

Lowest pricing. very simple process from start to checkout. A+++

It was easy to find the things I needed!

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy