Mansory Carbon Fiber Body kit set for Mercedes G-class AMG 6x6 Gronos

Mansory Gronos for the Mercedes-Benz G63 AMG 6x6 — Forge-Carbon on the six-wheel chassis

Between November 2013 and the close of 2015 Mercedes-AMG built roughly one hundred road-legal copies of the G63 AMG 6x6. The car was sold as a civilian sibling to the W461 6x6 the same workshop had been delivering to the Australian Defence Force from 2007. Mercedes stretched a regular W463 chassis, fitted a third live portal axle borrowed from the military programme, dropped the AMG M157 5.5 V8 BiTurbo in the engine bay and trimmed the cabin to Designo specification. The 6x6 sold out before any successor was planned and Mercedes never re-tooled the line. The cars trade hands now at a multiple of original sticker, almost entirely between collectors and Gulf principals — the platform's surviving population is concentrated, documented and mostly garaged. This page covers Mansory's Gronos programme dimensioned to that car: a Forge-Carbon overlay set rather than a widebody build, because the donor is already 2.10 metres wide on three portal axles and there is nothing useful to widen.

Two Mansory programmes exist for the 6x6 on Hodoor: this Gronos page (the Forge-Carbon signature) and the lighter visible-weave 6x6 Xtreme overlay. Cross-platform sister builds: the original W463 Gronos, the W463 Gronos Facelift and the W463A Gronos.

Donor scope — only the 2013-2015 civilian 6x6

The kit fits the road-legal civilian Mercedes-Benz G63 AMG 6x6 — Magna Steyr / AMG Affalterbach build window 2013-2015. Roughly 100 examples shipped, principally to the Gulf states, Russia, Hong Kong and a small European collector cohort. The kit does not fit the 2007-2013 W461 ADF military 6x6, Brabus / Carlex tuner six-wheel conversions on later chassis, the factory four-wheel G500 4x4², or the Oettinger 6x6 (different third-axle mounting geometry).

Chassis specifics

The 6x6 keeps the W463 cabin and front clip, then diverges sharply at the floorpan and rear two-thirds. Wheelbase: 3 428 mm, third axle stretched 700 mm rearward of the original W463 mid-span. Length: 5 875 mm. Width: 2 100 mm across the steel fender flares Mercedes welded on at build (a factory-widebody chassis). Ground clearance: 460 mm with portal-axle hub-reduction at all three live axles. Fording depth: 1 000 mm. Approach / departure / breakover: 52° / 54° / 33°. Kerb weight: ~3 775 kg. Transmission: AMG SpeedShift Plus 7G-Tronic with paddle shift; single-range transfer case modified for the third-axle drive split; locking differentials on all three axles (centre, rear, front sequence).

M157 5.5 V8 BiTurbo — the AMG side

The engine is the AMG-built M157 5.5-litre twin-turbo V8 — same block AMG ran across the G63, GL63, ML63, S63 and a wider family between 2010 and 2018. In 6x6 trim it is calibrated to 544 hp at 5 500 rpm and 760 Nm from 1 750 rpm. Acceleration to 100 km/h is governed at ~7.4 seconds, top speed limited to 160 km/h. The M157 is mature enough by 2026 that AMG-specialist independents handle routine wear items (head bolts, valve-cover gaskets, plastic plenum) without difficulty. The Mansory Powerbox is the same OBD-port piggyback module the firm offers across every M157 application — it lifts the donor to ~620 hp / 870 Nm with the optional valved sport-exhaust SKU. On a 3.78-tonne vehicle the change is felt in mid-range pull rather than in 0-100 km/h time.

Forge-Carbon Gronos panel set

The Gronos signature leans on Forge Carbon — the marbled, particulate-fibre finish that defines the W463A halo Gronos — rather than on traditional twill-weave. The dark mottled surface reads against the silver and matte-black paint signatures Gulf owners commission, and differentiates Gronos visually from the lighter Xtreme programme on the same donor.

• Vented Forge-Carbon bonnet pad — low-profile overlay with two functional NACA cuts above the M157 plenum, painted body colour by default with Forge-Carbon visible accents around the cuts.
• Forge-Carbon side step extensions — full-length running boards bridging the longer six-wheel wheelbase, dimensioned to clear the portal-axle ride height and the front-axle steering envelope.
• Spare-wheel cover frame — flat Forge-Carbon plate sized to the 6x6's full-width rear-mounted spare, with the option of a 3D-laminated MANSORY logo at order.
• Mirror caps in matched Forge Carbon, electrical pass-through unchanged for the OEM heated / power-fold harness.
• Rear bumper Forge-Carbon insert — diffuser-language strip below the OEM rear apron, cut for the AMG side-exit quad exhaust.
• Door handle covers in matched finish across the four cabin doors.
• D-pillar cover pair in Forge Carbon, replacing the OEM gloss-black trim panel.
• Engine cover side parts for the M157 plenum — Gronos signature detail in the engine bay.

Six-wheel forged set

The OEM 6x6 wheel is 22" — 5x130 PCD on an 84 mm centre bore (rather than the regular W463 71.6 mm bore), because the portal hub-reduction unit lives inside the wheel face. The Mansory M-series 22" forged set is catalogued as a six-wheel forging in matched offsets that mate to the portal hub without spacers. Six wheels trim ~25-30 kg total off unsprung mass against OEM cast — small in proportion against a 3.78-tonne kerb but the chassis settles measurably softer at highway speed. Tyre fitment: 325/55 R22 mud-terrain default, with 325/65 R22 all-terrain for sand-heavy use. Diamond black dominant; matte two-tone with bronze hub-cap second. Six-wheel TPMS via OEM Mercedes sensors. Catalogue at hodoor.world/collection/forgedwheels.

Gronos vs Xtreme — picking the surface

The two 6x6 programmes carry the same panel scope at different visual volumes. The 6x6 Xtreme is a glossy 2x2 twill-weave overlay with clear-coat lacquer; the surface reads brighter, the carbon language is louder against a paint colour, and it sits ~8-12 percent below Gronos on price. The Gronos (this page) leans on Forge Carbon — darker, busier surface, closer to colour-blocked than visible-weave, with the Gronos-series stamp on the back of each panel.

Where the 6x6 Gronos book sits

The 6x6 surviving population is geographically concentrated. Royal-family deliveries in the Gulf account for the largest single cluster; closed-network Russian and Kazakhstani buyers shipped a notable number of cars at original delivery; HK / Singapore hold small registered groups; a handful of European collectors complete the picture.

• UAE — Dubai and Abu Dhabi book the largest share of 6x6 Gronos commissions, often paired with the matching Cullinan in the same garage.
• Saudi Arabia and Qatar follow on similar profile; Saudi commissions lean more heavily on bullet-resistant donor cars from the original Affalterbach build sheet.
• Hong Kong 6x6 cars often run a more discreet single-tone paint signature; the Forge-Carbon Gronos reads well against the dark base-coat preference in that market.
• Monaco holds a steady European share, mostly garage-and-display rather than daily-driver.
• Tsar corridor serves the CIS lane through closed-network freight; the 6x6 is the third most-shipped Mansory G-build for that pipeline after the W463A Gronos and the Cullinan.
• Bermuda registers a single recorded 6x6 commission in the Gronos book — an outlier only because the chassis's small population makes every commission notable.

Build, lead time, ordering

Carbon set lay-up runs 5 to 7 weeks at the workshop — a touch longer than a regular W463 Gronos because the side-step length and side-trim panels are bespoke to the 6x6 wheelbase. Sea freight to GCC or East Asia is 22-26 days; the six-wheel forged set is air-freighted on most commissions. Body-shop turnaround is short — typically 4 to 6 working days — because nothing on the Gronos overlay requires fender cuts or bond-flange paint work. End-to-end timeline VIN-confirmed quote to keys: 9 to 11 weeks. Email [email protected] with the 6x6 VIN, paint code, panel selection, wheel finish, Powerbox / sport-exhaust opt-in, destination country. WhatsApp +44 7488 818747 — the 6x6 register is short enough that we usually know the donor's history before the message arrives.

FAQ

Is the kit the same as the 6x6 Xtreme set with different surface treatment?
Substantially yes — same panel scope, same body datums, same fitment hours. The Gronos set ships in Forge Carbon (the marbled-particulate finish) on every visible piece, with the Gronos-series back-stamp on each panel. The Xtreme set ships in 2x2 twill-weave visible carbon under clear lacquer. Owners who change their mind between order and delivery can swap surface treatment per-panel up to the lay-up cut; the programmes share identical mounting flanges.

Can the matched six-wheel forged set be split across donors?
No — the forged set is dimensioned, balanced and TPMS-paired as a six-wheel commission. Owners who want a partial replacement (front pair only, or rear-axle pair only) order separate two-wheel sets at the same pattern and finish; we do not split the original six-wheel batch. The dimensional mate-up to the portal hub on the OEM 22" cast is straightforward — owners often run a Mansory front-pair replacement first and add the rear four wheels at the next service interval.

Does the M157 Powerbox affect the AMG warranty?
The 6x6 is past the OEM warranty window in 2026 — the youngest cars built are now over a decade old. Service is handled by AMG-specialist independents in most markets, and the Powerbox is OBD-port reversible at any service interval. Documented Powerbox use does not introduce reliability concerns the M157 does not already exhibit at age and mileage.

Will the kit fit a Brabus 6x6 conversion or an Oettinger 6x6?
No. Brabus G65 6x6 conversions on later chassis use different fender geometry and different powertrain placement; the Oettinger 6x6 sits on a W461 platform with leaf-spring rear axles and does not share the W463-derived bodywork the Mansory Gronos panels are dimensioned to. The kit on this page fits the factory G63 AMG 6x6 only.

Can the spare-wheel cover be commissioned without the rest of the kit?
Yes — every panel ships as a standalone SKU on quote. The spare-wheel cover and the bonnet pad are the most-ordered single panels for owners who want a partial Gronos read on an otherwise OEM-presentation 6x6.

Are replacement Forge-Carbon panels available in 2026 if a delivery scuff happens?
Yes. Mansory keeps the 6x6 Gronos lay-up tooling active; replacement single-panel orders run on a 4-5 week lay-up window from Brand-Erbisdorf.