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Tein GSQ74-91AS2 Street Advance Z Coilovers 2013-2017
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Tein 14+ Lexus IS250 (GSE30L)/IS350 (GSE31L) Street Advance Z Coilovers

Tein
TEINGSQ74-91AS2
4582202761591
Coilovers
6 Units In Stock - Ships Next Business Day
$ 900.00 $ 855.00
$ 855.00

Dial-In Street Performance for Your Lexus IS200t

The Tein GSQ74-91AS2 Street Advance Z coilover kit gives Lexus IS200t, Lexus IS250, Lexus IS350 owners a direct upgrade path from worn OE dampers to a fully height-adjustable, twin-tube coilover system. Built around Tein's 16-way damping adjustment dial, the GSQ74-91AS2 lets you fine-tune compression and rebound to match daily commuting, weekend canyon runs, or light track days without swapping hardware. Every GSQ74-91AS2 kit ships with Tein's No-Sag springs and TEIN-Green powder-coated shell cases, so the GSQ74-91AS2 holds its ride height and finish long after installation.

Key Features

  • Twin-tube damper system for a longer stroke, smaller repulsive force, and high ride comfort
  • 16-way damping force adjustment dial lets you dial in compression and rebound feel for street or spirited driving
  • Ride height adjustable via the lower spring seat, independent of damping settings
  • No-Sag Spring cold-formed from SAE9254 steel with a minimum tensile strength of 200 kgf/mm2
  • TEIN-Green two-layer, one-bake powder coating (Japanese patent 4347712) for durable, solvent-free corrosion protection
  • ZTP-coated ride-height adjustment threads resist abrasion and rust-seizure over time
  • High-performance damper oil formulated for stable viscosity, anti-foaming, and cavitation resistance across temperature swings
  • EDFC-compatible on applicable vehicles for optional remote damping control

Fitment Table

Year Range Make Model Trim
2016-2017 Lexus IS200t Base
2016-2017 Lexus IS200t F Sport
2013-2015 Lexus IS250 Base
2013-2016 Lexus IS350 Base
2014-2017 Lexus IS350 F Sport

Specifications

Detail Value
MPN GSQ74-91AS2
Series Street Advance Z
Damper Type Twin-tube, damping force adjustable (16-way)
Adjustability Ride height (lower spring seat) and damping force
Spring Type No-Sag cold-formed SAE9254 steel spring
Finish TEIN-Green two-layer powder coating
EDFC Compatible Yes, on applicable vehicles
Fitment Lexus IS200t, Lexus IS250, Lexus IS350

What's Included

  • 4 Tein Street Advance Z dampers with integrated 16-way damping adjustment dials
  • 4 No-Sag springs, pre-fitted to the lower spring seats
  • Ride height adjustment wrenches
  • Damping force adjustment tool
  • Installation instruction manual

About Tein

Tein has engineered coilovers and suspension components in Japan since 1985, and the Street Advance Z series carries that engineering into a daily-drivable, adjustable coilover built for street enthusiasts. Tein's sealed damper construction and patented TEIN-Green coating are designed to keep kits like the GSQ74-91AS2 performing and looking new well past installation day.

FAQ

What is the GSQ74-91AS2?

The GSQ74-91AS2 is a Tein Street Advance Z coilover kit built for Lexus IS200t, Lexus IS250, Lexus IS350. It pairs a twin-tube, 16-way adjustable damper with a No-Sag spring and full ride-height adjustment for street use.

Does the kit include upper mounts?

No, the Street Advance Z series reuses the vehicle's factory upper mounts, which are not included.

Can I adjust ride height after installation?

Yes, the GSQ74-91AS2 kit adjusts ride height via the lower spring seat independent of the damping settings.

Is the damping force adjustable?

Yes, the GSQ74-91AS2 includes a damping force adjustment dial so you can tune compression and rebound feel.

Is this kit EDFC compatible?

The Street Advance Z line is EDFC compatible on applicable vehicles, letting you add Tein's electronic damping control accessory later. Confirm compatibility for your specific chassis before ordering EDFC parts.

Will this coilover kit pass a daily-driving comfort test?

Yes, the GSQ74-91AS2 uses a twin-tube damper design that Tein tunes for smooth low-speed comfort and stable high-speed control, making it a comfortable daily-driver-friendly coilover.

How is the spring finished?

Every GSQ74-91AS2 spring is cold-formed from SAE9254 steel and coated with a durable, peel-resistant powder finish.

What is the shell case coating?

The GSQ74-91AS2 shell cases use Tein's patented TEIN-Green two-layer, one-bake powder coating for corrosion resistance.

Install Instructions

  1. Raise and safely support the vehicle, then remove the wheel on the corner being serviced
  2. Disconnect the factory shock or strut assembly and remove it, retaining the OE upper mount
  3. Set the GSQ74-91AS2 damper to your target ride height using the lower spring seat before installation
  4. Attach the OE upper mount to the GSQ74-91AS2 damper shaft and torque to factory specification
  5. Install the assembled GSQ74-91AS2 coilover into the vehicle and torque all mounting hardware to spec
  6. Reinstall the wheel, lower the vehicle, and set the damping dial to your preferred setting
  7. Have an alignment performed before extended driving

Request For Information

Have questions about Tein 14+ Lexus IS250 (GSE30L)/IS350 (GSE31L) Street Advance Z Coilovers? Fill out the form below and we'll get back to you by the next business day.
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