The Mercedes-AMG G 63 already has one of the most recognisable silhouettes on the road, which is exactly why owners want to make it their own. A carbon widebody kit is the most visible way to do that. Done properly, it changes the stance of the car, opens room for wider wheels and cuts weight from the panels it replaces.
What a widebody kit actually includes
A complete kit usually covers front and rear fender flares, a new front bumper with larger air intakes, a rear bumper with a diffuser, side skirts, a bonnet scoop or vented bonnet, and a roof spoiler with integrated LED lights. Some kits also replace the spare wheel cover and mirror caps. On a G 63, the flares typically add 60 to 100 mm to the overall width, which changes how the car sits visually from every angle.
Why carbon fibre instead of fibreglass
Fibreglass is cheaper, but it is heavier, more prone to cracking and harder to fit with tight panel gaps. Pre-preg carbon fibre cured in an autoclave is lighter, stiffer and keeps its shape in heat and cold. On an off-road capable car that sees gravel, salt and temperature swings, that durability matters. Visible carbon also needs a quality UV-resistant clear coat, otherwise the weave yellows within a couple of seasons.
Wheels, tyres and suspension go together
Wider arches look empty with stock wheels. Most widebody builds move to 23 or 24 inch forged wheels with a lower offset to fill the flares. That in turn affects tyre choice, steering feel and load on the hubs. A lowering module for the factory adaptive suspension or adjustable coilovers is often added so the car sits correctly in the new arches without losing ride comfort.
Fitment is where quality shows
The difference between a good and a poor conversion is in the details: even panel gaps, factory-like mounting points, correct sealing around sensors and parking cameras, and paint matched to the original colour code. Front radar, parking sensors and headlight washers must work exactly as before. A reputable tuning studio such as Custom Class will test-fit every part before painting and calibrate driver assistance systems after assembly.
Questions to ask before ordering
- Is the kit made from pre-preg or wet-lay carbon?
- Does it keep the original lights, sensors and washers working?
- What wheel size and offset is it designed around?
- Is the conversion reversible?
- What warranty covers the parts and the paintwork?
A widebody kit is a significant investment. Choosing a proven design and an experienced installer is what turns it from a styling experiment into a finished, factory-quality G 63.
Article 2. Upgrading the Exhaust on a Mercedes-AMG G 63: Sound, Weight and Legal Limits
Meta title: Mercedes-AMG G 63 Exhaust Upgrade: Sound, Valves and Materials
Meta description: What an aftermarket exhaust gives a Mercedes-AMG G 63: titanium vs steel, valve control, sound levels and how to stay within road-legal limits.
The 4.0-litre twin-turbo V8 in the Mercedes-AMG G 63 sounds good from the factory, but the stock exhaust is tuned for compromise. It has to pass noise regulations in every market and suit owners who want a quiet morning start. An aftermarket system lets you choose the character of the car instead of accepting the default.
What can be replaced
The G 63 exhaust has three main sections: downpipes after the turbochargers, the mid-section with catalytic converters and particulate filters, and the rear silencers with the iconic side-exit tips. Most road-focused upgrades replace only the rear section, the cat-back system. It keeps emissions equipment intact while changing sound and saving weight. Downpipe replacements bring more power but almost always require ECU recalibration and affect emissions compliance.
Titanium or stainless steel
Titanium systems are the premium option. They can weigh up to 50 percent less than the factory steel parts and develop a distinctive blue and gold heat tint on the tips. High-grade stainless steel is heavier and more affordable, but it is durable and easier to repair. Both are a long-term upgrade over aluminised steel when the car sees winter roads and salt.
Valve control is the key feature
Modern performance exhausts use electronically controlled valves. When closed, exhaust gas runs through the silencers and the car stays quiet in residential areas. When opened, the gas takes a more direct path and the V8 becomes much louder. A good system integrates with the factory AMG drive modes, so the valves respond to Comfort, Sport and Sport+ without a separate remote. Some systems also offer a smartphone app or key fob control.
Sound levels and road legality
Louder is not always better. A well-designed exhaust removes drone at motorway speeds and keeps a deep tone instead of a raspy one. It is also important to check homologation. Certified systems come with documentation confirming noise and emissions compliance, which makes inspections and insurance much simpler. Removing particulate filters may look attractive for sound, but it can lead to inspection failures and fines in many countries.
Installation and setup
A cat-back system on a G 63 can usually be installed in a day without cutting the body. Experienced tuners such as Custom Class check heat shielding, hanger alignment and valve wiring, then confirm that no fault codes appear in the engine control unit. A short road test in every drive mode completes the job.
An exhaust upgrade is one of the most noticeable changes you can make to a G 63. Chosen carefully, it adds character every time the engine starts without making the car tiring to live with.