IronBox BMW E8x / E9x Adjustable Rear Suspension Arm Kit — 6-Piece

This IronBox six-piece adjustable rear suspension arm kit is designed to provide precise rear-geometry setup for BMW E8x and E9x drift, track and performance builds

The kit replaces three pairs of original rear suspension links with adjustable camber, toe and guide arms

The available adjustment allows negative, zero or positive suspension angles to be configured according to the vehicle setup, ride height, tyre package and intended use

Floating joints provide a more rigid and precise suspension connection than conventional compliant bushings, helping maintain the selected rear geometry under high loads
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Main features
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• Complete six-arm set — replaces three pairs of rear suspension links
• Camber adjustment — allows the rear camber angle to be configured for the required setup
• Toe adjustment — provides additional control over rear-wheel toe
• Adjustable guide links — complete the rear suspension geometry setup
• Wide geometry range — supports negative, zero and positive angle configurations
• Floating-joint construction — reduces unwanted elastic movement under suspension loads
• More precise rear-axle behaviour — intended to provide consistent suspension response during drifting, acceleration, braking and cornering
• Aluminium-alloy and steel construction — combines different materials according to the function of each component
• Anodized aluminium components — provide a durable surface finish
• Blacknitride-treated steel components — provide corrosion protection and a clean dark finish

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Compatibility
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• BMW 1 Series E81
• BMW 1 Series E82
• BMW 1 Series E87
• BMW 1 Series E88
• BMW 3 Series E90
• BMW 3 Series E91
• BMW 3 Series E92
• BMW 3 Series E93

Designed for vehicles using the corresponding standard BMW E8x or E9x rear suspension arrangement

Final compatibility must be confirmed using the vehicle model, rear suspension configuration and original mounting dimensions
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Fitment requiring confirmation
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• BMW E82 1M
• BMW E90 M3
• BMW E92 M3
• BMW E93 M3
• BMW E8x and E9x xDrive models
• Vehicles with M3, 1M or mixed rear suspension conversions

IronBox does not separately confirm these configurations on the product page
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Not compatible with
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• BMW E84 X1 unless compatibility is separately confirmed
• BMW F-series vehicles
• Other BMW chassis with a different rear suspension layout

Installations using different mounting widths, bolt diameters or suspension-link geometry
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Kit includes
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• Adjustable rear camber arm — 2 pcs
• Adjustable rear toe arm — 2 pcs
• Adjustable rear guide arm — 2 pcs
• Mounting hardware is not listed by IronBox and should not be assumed to be included

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Street-use consideration
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Floating joints create a more direct suspension connection and may transmit more noise, vibration and road harshness than the original rubber-bushed arms

The kit is primarily intended for drift, track and performance-oriented vehicles where adjustability and suspension precision are prioritised over factory comfort
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Important installation information
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Confirm the exact rear suspension configuration and mounting dimensions before ordering
Compare the length and mounting orientation of every new arm with the corresponding original component before installation

Install each pair of arms in the correct suspension position

Maintain sufficient thread engagement across the complete adjustment range

Do not operate the vehicle with exposed or insufficiently engaged adjustment threads

Check clearance around the wheels, tyres, brake lines, driveshafts, subframe and body through the complete suspension travel

All fasteners and adjustment-locking components must be correctly tightened before use

A complete professional rear-wheel alignment is required after installation

Extreme camber or toe settings can negatively affect stability, tyre wear, grip and suspension clearance

Installation and geometry adjustment must be performed by a qualified suspension or motorsport specialist