Tein GSR66-8USS2 Street Basis Z Coilovers 02-07 Mitsubishi Lancer ES OZ Rally

Vehicle Fitment

• 2002-2007 Mitsubishi Lancer ES (CS6A, FWD, 2.0L L4)
• 2002-2007 Mitsubishi Lancer OZ Rally (CS6A, FWD, 2.0L L4)
• 2004-2007 Mitsubishi Lancer Ralliart (CS7A, FWD, 2.4L L4)

Fitment Notes

• FWD only - does NOT fit the Lancer Evolution (CT9A/CZ4A) or any AWD Lancer variant
• Does NOT fit the 2008+ Lancer (CY/CZ platform - 8th generation) - CS6A/CS7A chassis only
• OEM upper mounts (front and rear) must be reused - upper mounts are NOT included with this kit
• Damping force is fixed (non-adjustable) - factory-calibrated by Tein for this application
• Camber adjustment is not available with this kit - OEM geometry is retained at the top mount
• Lowering ranges differ by sub-model - ES, OZ Rally, and Ralliart each have distinct drop ranges due to differences in stock ride height; see Specifications for per-trim details

Features

• Height-adjustable coilover system - threaded lower collar and ZT-coated spring seat allow precise ride height setting within the full lowering range
• Twin-tube damper construction delivers longer stroke with lower initial repulsive force compared to mono-tube designs, providing superior ride compliance on varied road surfaces at lowered heights
• Fully sealed crimped damper structure - shell pipe narrowed, oil and gas injected, and unit sealed by metal crimping for a compact, durable, and cost-effective build
• Fixed damping factory-calibrated by Tein engineers for the CS6A/CS7A Lancer platform - matched spring and damper setup ready to use out of the box
• ZT-coated threaded sleeve resists corrosion and ensures smooth, consistent collar adjustment
• SAE9254 cold-formed springs with minimum tensile strength of 200 kgf/mm² - sag-proof, resilient, and durable in all weather and driving conditions
• Powder-coated spring finish is chip-resistant and corrosion-resistant
• Delrin spring seat washer allows the lower seat to rotate freely beneath the spring, reducing bind during height adjustment
• Ergonomic long-handled flanged adjustment wrenches included for easier, more controlled collar adjustment
• Shortened shell case design provides optimum damper stroke at reduced ride heights
• Manufactured in Japan to strict Tein quality control standards

Specifications

• Part Number: GSR66-8USS2
• Product Line: Street Basis Z (SBZ)
• Part Type: Coilover Damper Kit (Full Set - Front and Rear)
• Vehicle Platforms: Mitsubishi Lancer CS6A (ES / OZ Rally, 2002-2007); CS7A (Ralliart, 2004-2007)
• Damper Type: Twin-Tube
• Damping Adjustment: Fixed (Non-Adjustable)
• Height Adjustment: Thread-Type (Lower Spring Seat)
• Spring Rate (Front): 6.0 kgf/mm (336 lb/in)
• Spring Rate (Rear): 4.0 kgf/mm (224 lb/in)
• Spring Inner Diameter (Front): 70mm
• Spring Inner Diameter (Rear): 65mm
• Spring Material: SAE9254 Cold-Formed Steel (Min. 200 kgf/mm² Tensile Strength)
• Spring Finish: Powder Coated
• Sleeve Coating: ZT (Corrosion Resistant)
• Upper Mounts (Front): OEM Reuse Required - NOT Included
• Upper Mounts (Rear): OEM Reuse Required - NOT Included
• Lowering Range - ES (CS6A): Front 1.1 in.-3.5 in. / Rear 0.3 in.-2.8 in.
• Lowering Range - OZ Rally (CS6A): Front 1.5 in.-3.9 in. / Rear 0.7 in.-3.2 in.
• Lowering Range - Ralliart (CS7A): Front 0.7 in.-3.1 in. / Rear 0.1 in.-2.4 in.
• Drivetrain: FWD
• Position: Front and Rear (Full Kit - 4 Dampers)
• Quantity: 4 (Complete Set)
• Country of Manufacture: Japan
• Warranty: 1-Year Limited (through authorized Tein dealers)

Included Components

• 2x Front Coilover Assemblies (Left and Right)
• 2x Rear Coilover Assemblies (Left and Right)
• 1x Set of Adjustment Wrenches (Ergonomic Long-Handle, Flanged)
• 1x Delrin Spring Seat Washers
• 1x Installation Hardware

Product Description

The Tein Street Basis Z (Part #GSR66-8USS2) is a height-adjustable coilover kit designed for the 2002-2007 Mitsubishi Lancer ES and OZ Rally (CS6A platform, FWD, 2.0L) and the 2004-2007 Lancer Ralliart (CS7A platform, FWD, 2.4L). As an entry-level coilover system, the Street Basis Z gives Lancer owners meaningful ride height control via a threaded lower spring seat, while pairing a factory-matched spring and damper combination to eliminate any guesswork in setup. Spring rates of 6.0 kgf/mm (336 lb/in) front and 4.0 kgf/mm (224 lb/in) rear are selected for a front-heavy FWD layout, with the stiffer front rate managing weight transfer into corners and the softer rear rate maintaining compliance for daily driving over urban road surfaces.

The fixed damping is calibrated by Tein's engineers for the CS6A/CS7A chassis dynamics, delivering a sporting yet streetable baseline setup that requires no damper adjustment from the owner. The twin-tube damper architecture provides the stroke length and low initial resistance necessary to maintain ride quality even when the car is set well below stock. Lowering ranges differ across sub-models - the OZ Rally offers the widest drop (up to 3.9" front, 3.2" rear) due to its higher factory ride height versus the more aggressive stock geometry of the Ralliart, which offers a more moderate range (0.7"-3.1" front, 0.1"-2.4" rear). The ES sits between these extremes at 1.1"-3.5" front and 0.3"-2.8" rear.

This kit is strictly for FWD variants of the 7th generation Lancer (CS6A/CS7A) and does not fit the Lancer Evolution, AWD variants, or the 2008+ Lancer (CY/CZ platform). OEM upper mounts must be reused at front and rear and are not included with this kit. Manufactured in Japan to Tein's strict quality control standards and backed by a 1-year limited warranty through authorized Tein dealers, the Street Basis Z GSR66-8USS2 is the most affordable entry point into the Tein coilover lineup for CS6A and CS7A Lancer owners seeking a quality height-adjustable upgrade.