Mercedes-AMG GLS 63 (X167) Tuning Guide 2026 — Mansory, Brabus & Body Kits

The Mercedes-AMG GLS 63 (X167) is the most powerful full-size luxury SUV in the AMG lineup — a 585 hp beast that can tow five passengers in first-class comfort and launch to 100 km/h in 4.2 seconds. Its MHA platform, shared with the GLE and GLC families, gives tuners a mature, well-understood base to work with. From mild aesthetic enhancements to full 800 hp conversions, the aftermarket support for the X167 is among the deepest in the luxury SUV segment. This guide covers everything you need to know about taking your GLS 63 further in 2026.

Body Kits for Mercedes-AMG GLS 63 (X167)

Brabus 800 GLS — The Flagship Statement

The Brabus 800 GLS programme is the definitive transformation for the X167. The body kit centres on a reshaped front fascia with Brabus-signature carbon fibre front spoiler, wider front apron with integrated air channels, and carbon fibre side skirt extensions that add visual mass without raising ride height. At the rear, a carbon diffuser and Brabus-branded exhaust outlets complete the full-system look. The 800 designation refers not only to the body but to the full powertrain upgrade — making this the most comprehensive factory-grade programme available. Expect aggressive price points, but for clients who want the complete Brabus 800 identity, there is no substitute.

Mansory Visionary M — Widebody Prestige

Mansory's Visionary M package pushes the GLS 63 into full widebody territory. Distinctive features include carbon-fibre bonnet vents, redesigned front bumper with large air intakes, side-skirt extensions with integrated LEDs, and a prominent rear diffuser. Mansory uses pre-preg carbon fibre throughout, and the fitment is engineered specifically for the X167 — no trimming required. The Visionary M package pairs naturally with Mansory's 22" or 23" forged wheels and is available in full carbon-visible or painted-over finishes. This programme has been exhibited at Geneva and IAA and is well-supported with installation partner networks across Europe and the Gulf.

TopCar Inferno — Track-Inspired Aggression

TopCar Design's Inferno body kit for the GLS 63 takes a more track-focused aesthetic approach. The front apron features sharp angular splitters and dive planes drawn from motorsport. Wide-arch extensions give the X167 a planted stance, and the rear spoiler wing is functional in design rather than merely decorative. TopCar offers the Inferno in full carbon or lightweight fibreglass composites, which reduces cost without sacrificing the visual impact. Installation is straightforward with provided templates and hardware, and TopCar's global dealer network supports fitment in over 30 countries.

Lumma Design CLR 8S — European Elegance

Lumma Design's CLR 8S conversion for the GLS-Class X167 represents the European tuning philosophy — refinement rather than aggression. The CLR 8S features subtly flared arches, a redesigned front bumper with integrated daytime running light surrounds, and a rear valance that integrates the quad exhausts cleanly. Lumma builds in Germany, and all CLR 8S components are TÜV-certified for road use in the EU. This is the body kit of choice for clients who want a recognisably tuned car that does not compromise on the factory aesthetic language.

Wheels for Mercedes-AMG GLS 63 (X167)

The GLS 63 X167 rides on a 5×112 bolt pattern — the same as all modern Mercedes-Benz platforms — and accepts wheel diameters from 21" up to 24" in aftermarket configurations. The recommended width range is 9.5–11J at the front and 10–11.5J at the rear, with tyre profiles adjusted accordingly for ride quality versus handling sharpness.

Leading forged wheel brands for the X167 include HRE Performance Wheels (particularly the S201 and P101 in monoblock finish), Vossen Forged (the HF-7 and ML-R3 in brushed titanium or matte black), Brabus Monoblock Z Platinum Edition (10-spoke forged at 23" as OEM Brabus fitment), and Mansory 10-spoke forged in 23–24" sizing. For clients seeking a more subdued look, AMG cross-spoke upgrading to 22" remains a popular option.

Tyre pairing for 22" fitment: 295/35 R22 front and rear is the balanced option. Moving to 23" typically requires 305/30 R23 or 295/30 R23. At 24", 305/25 R24 is aggressive and ride comfort is noticeably reduced — this sizing is primarily for show or warm-climate markets.

Performance Upgrades — Mercedes-AMG GLS 63 (X167)

Brabus 800 Engine Stage — 800 hp from 4.0L V8

The Brabus 800 powertrain package for the AMG GLS 63 is the headliner of the entire X167 tuning world. Starting from the standard 585 hp, Brabus replaces the turbochargers with high-performance units, installs a revised cylinder head with Brabus-ported intake and exhaust ports, upgrades the fuel injection system, and applies proprietary ECU mapping. The result is 800 hp (588 kW) and 1,000 Nm of torque — a 37% power increase. Despite this, Brabus maintains the 9G-TRONIC gearbox with reinforced clutch packs and upgrades the 4MATIC+ transfer case accordingly. The 0–100 km/h time drops to 3.8 seconds. Brabus backs this with a full 3-year drivetrain warranty when installed at authorised Brabus partners.

Mansory Stage 1 — 650 hp

Mansory's Stage 1 ECU remap and hardware upgrade for the GLS 63 lifts output to 650 hp and 850 Nm of torque. The package includes new intercooler piping, a sport air filter system, and an ECU reflash optimised for 98RON fuel. This is the most accessible high-power upgrade for the X167 — installation takes less than a day at an authorised Mansory dealer, and drivability in city conditions remains fully intact. The 0–100 km/h time improves to approximately 3.9 seconds.

Exhaust Systems

The AMG GLS 63 benefits significantly from an aftermarket exhaust. Brabus offers a full cat-back exhaust system in stainless steel or titanium with active valve control (compatible with the factory AMG exhaust mode buttons). TopSpeed Pro offers a non-resonated sports exhaust that opens a distinctive V8 bark without eliminating the bass character of the M177. Akrapovič has released a slip-on line for the X167 in titanium with carbon end caps — the most acoustically refined option at a mid-tier price.

Interior Upgrades — Mercedes-AMG GLS 63 (X167)

The X167 cabin is already a high-specification environment, but the aftermarket pushes further. Mansory's interior programme includes full Alcantara headliner replacement, carbon-fibre dashboard inlays (replacing the factory piano black or open-pore wood), and custom steering wheel trimming with Mansory-stitched leather and carbon. Brabus offers a full "Masterpiece" interior package with individual colour-matching from the Brabus Manufaktur programme.

For clients seeking standalone upgrades, the most popular items are carbon-fibre door sill panels with illuminated GLS or AMG logos, custom floor mats with embossed branding (available from Nappa Excellence and Lorinser), and ambient lighting kit extensions that go beyond the 64-colour factory setup. Brabus and Mansory both offer Burmester-compatible audio system upgrades with custom speaker grille covers in carbon or leather-wrapped aluminium.

Seat reupholstery in Nappa or semi-aniline leather with contrast stitching is the single most impactful interior modification for visual effect — expect lead times of 4–8 weeks from top German ateliers.

How It Compares: AMG GLS 63 vs BMW X7 M60i in Tuning Potential

The Mercedes-AMG GLS 63 (X167) and the BMW X7 M60i (G07) occupy the same market segment — full-size luxury SUVs with serious performance credentials — but their tuning ecosystems differ significantly in 2026.

The GLS 63 enjoys a clear edge in depth of tuner support. Brabus has built an entire sub-brand around it — the Brabus 800 GLS — which is a complete vehicle transformation with its own VIN designation, factory warranty, and global sales network. Mansory's Visionary M, TopCar's Inferno, and Lumma's CLR 8S collectively offer four distinct full-programme body kits, each with regional dealer coverage. For a buyer who wants a turnkey transformed car with warranty support, the GLS 63 is the superior choice in 2026.

The BMW X7 M60i benefits from AC Schnitzer's involvement, which is arguably the most polished and TÜV-certified programme available for BMW's flagship SUV. AC Schnitzer's aesthetic upgrades are refined, their wheel fitments are industry-leading in engineering quality, and their ECU stages are fully emissions-compliant. However, AC Schnitzer does not offer anything in the 700–800 hp territory — the X7 M60i's S68 engine does not have the same aftermarket powertrain ecosystem that Brabus has built around the M177.

In terms of aggression potential, the AMG GLS 63 wins decisively. Brabus 800 hp versus AC Schnitzer's modest power increments is not a close contest. The X7 M60i is the better-tuned choice for someone who wants factory-adjacent refinement with mild performance enhancement. The GLS 63 is the platform for clients who want the most aggressive, high-power large luxury SUV that money can build — and the aftermarket exists to deliver exactly that.

Both platforms support 22–24" wheel fitments and share the 5×112 bolt pattern, making wheel sourcing equally accessible. The GLS 63 edges ahead on interior customisation depth too — Brabus Manufaktur bespoke interior programmes are unmatched in the segment. For raw tuning ambition, the X167 is the benchmark in its class.

FAQ — Mercedes-AMG GLS 63 (X167) Tuning

What is the most powerful tuning package available for the AMG GLS 63?

The Brabus 800 GLS is the most powerful aftermarket programme for the Mercedes-AMG GLS 63 (X167), producing 800 hp and 1,000 Nm of torque from the standard 4.0L M177 V8. It includes replacement turbochargers, cylinder head modifications, ECU mapping, and a reinforced drivetrain. Brabus backs the package with a 3-year drivetrain warranty at authorised partners.

Will body kit modifications affect my GLS 63 warranty?

Body kit installations by approved tuning companies — Brabus, Mansory, and Lumma in particular — do not typically void the Mercedes-Benz base warranty on unrelated systems. However, powertrain modifications such as ECU remaps can void the AMG powertrain warranty unless performed by an authorised partner (as is the case with Brabus). Always confirm with your MB dealer before installation.

What wheel sizes fit the AMG GLS 63 X167?

The GLS 63 X167 accepts 21" to 24" diameter aftermarket wheels on its 5×112 bolt pattern. The factory AMG spec is 22" (on optional AMG Night Package). Most body kit programmes, including Mansory Visionary M and Brabus 800, are designed to pair with 22–23" fitments. Going to 24" is possible but reduces ride comfort noticeably.

How much does a full Mansory Visionary M programme cost?

The Mansory Visionary M complete package for the GLS 63 X167, including body kit, interior trim, and forged wheels, typically ranges from €60,000 to €90,000 depending on specification and regional taxes. Individual components — such as the carbon front lip or carbon diffuser — are available separately. Contact Mansory directly or through Hodoor for current pricing: [email protected]