Does the Fabspeed MaxFlo Performance Exhaust fit my G 63?

Yes. This catback system is engineered specifically for the 2015-2018 W463 Mercedes-AMG G 63 with the 5.5L twin-turbo V8. It bolts to the factory mounting points with no cutting or welding and retains the factory exhaust valve control, so everything functions as designed. It does not fit the later W463A (2019-present) G 63, which uses a different engine and exhaust layout.

How loud is it, and does it drone on the highway?

Closed, the valves keep cruising manners civil and drone-free; opened, the dual MaxFlo resonators and investment-cast Y-pipe free a deeper, harder-edged twin-turbo V8 roar with more volume and character than the factory system. Because it works with the G 63's Valvetronic valves, you choose when it stays quiet and when it comes alive.

Does the Fabspeed MaxFlo Performance Exhaust add horsepower?

Yes. On Fabspeed's dyno it delivered peak gains of 19 horsepower and 21 lb-ft, with gains reaching 22 horsepower and 31 lb-ft through the midrange. Replacing the restrictive factory mufflers with free-flowing MaxFlo resonators cuts backpressure, so the twin-turbo V8 breathes more freely across the rev range.

Is installation bolt-on?

Yes. The system is a direct bolt-on that uses the factory hangers and mounting points, with no cutting, welding or tuning required. Most owners have it fitted in a few hours at an independent shop. Every pipe is CNC mandrel-bent and 3D laser-scanned to the vehicle, so the tips sit correctly and factory clearance is retained.

What are the tips and pipes made from, and what finishes are available?

The system is built from CNC mandrel-bent T304L stainless steel with an investment-cast stainless Y-pipe. The quad tips come in four finishes, Polished, Satin, Black Carbon Fiber and Titanium, selected at checkout, so you can match the look to the vehicle. The tips are backed by Fabspeed's lifetime warranty against defects.

Is it a complete catback system?

Yes. It replaces everything from the factory mufflers back while leaving the upstream emissions hardware in place. Nothing forward of the Y-pipe connection is altered, so the vehicle's factory emissions equipment is untouched and the installation is fully reversible.

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Description

Fabspeed Maxflo Performance Exhaust w/ Quad Tips for W463 Mercedes-AMG G 63

Fabspeed’s Maxflo Performance Exhaust with Quad Tips replaces the heavy, restrictive factory Mercedes-Benz mufflers with a dyno-developed system that unlocks a deeper, more authoritative AMG V8 soundtrack and meaningful weight reduction. Calibrated for a muscular twin-turbo tone, it delivers a significantly louder, rumbling exhaust note that matches the car’s performance character. On Fabspeed’s DynoJet, testing showed peak gains of +19hp and +21ft-lbs, with maximum increases of +22hp and +31ft-lbs — proof that the improved flow translates into real, seat-of-the-pants results.

Features

Gains of 22hp and 31ft/lbs
Saves 19lbs compared to OEM equipment
Investment cast stainless Y-pipe, dual maxflo resonators
3D laser scanned and CAD developed
Constructed from CNC mandrel-bent T304L stainless
Your choice of quad tip configuration
Simple bolt on installation, no cutting or welding required
All Fabspeed performance products are backed by the Fabspeed lifetime warranty

Applications

Mercedes-AMG G 63: W463 | 2015-2018 | 5.5L Twin-Turbo V8

Notes

All Fabspeed products are expected to ship within one week of order, though timelines are often much quicker

Frequently Asked Questions

Does the Fabspeed MaxFlo Performance Exhaust fit my G 63? Yes. This catback system is engineered specifically for the 2015-2018 W463 Mercedes-AMG G 63 with the 5.5L twin-turbo V8. It bolts to the factory mounting points with no cutting or welding and retains the factory exhaust valve control, so everything functions as designed. It does not fit the later W463A (2019-present) G 63, which uses a different engine and exhaust layout.
How loud is it, and does it drone on the highway? Closed, the valves keep cruising manners civil and drone-free; opened, the dual MaxFlo resonators and investment-cast Y-pipe free a deeper, harder-edged twin-turbo V8 roar with more volume and character than the factory system. Because it works with the G 63’s Valvetronic valves, you choose when it stays quiet and when it comes alive.
Does the Fabspeed MaxFlo Performance Exhaust add horsepower? Yes. On Fabspeed’s dyno it delivered peak gains of 19 horsepower and 21 lb-ft, with gains reaching 22 horsepower and 31 lb-ft through the midrange. Replacing the restrictive factory mufflers with free-flowing MaxFlo resonators cuts backpressure, so the twin-turbo V8 breathes more freely across the rev range.
Is installation bolt-on? Yes. The system is a direct bolt-on that uses the factory hangers and mounting points, with no cutting, welding or tuning required. Most owners have it fitted in a few hours at an independent shop. Every pipe is CNC mandrel-bent and 3D laser-scanned to the vehicle, so the tips sit correctly and factory clearance is retained.
What are the tips and pipes made from, and what finishes are available? The system is built from CNC mandrel-bent T304L stainless steel with an investment-cast stainless Y-pipe. The quad tips come in four finishes, Polished, Satin, Black Carbon Fiber and Titanium, selected at checkout, so you can match the look to the vehicle. The tips are backed by Fabspeed’s lifetime warranty against defects.
Is it a complete catback system? Yes. It replaces everything from the factory mufflers back while leaving the upstream emissions hardware in place. Nothing forward of the Y-pipe connection is altered, so the vehicle’s factory emissions equipment is untouched and the installation is fully reversible.

About Fabspeed

Fabspeed Motorsport is situated in Fort Washington, Pennsylvania, within the United States of America. Their extensive 26,000 sqft. facility serves as a hub for various car clubs, including Porsche Club of America, Ferrari, McLaren, Lamborghini, and more. The company is renowned for its comprehensive approach to product development. They handle the entire process, from design and engineering to dyno testing, street trials, and racing assessments, ensuring the quality and performance of every item. Fabspeed also collaborates closely with race engine builders and tuners hailing from Italy, Germany, and the United States, resulting in the creation of the Ultimate Performance parts. To cater to their passionate global audience, Fabspeed meticulously crafts systems using aerospace-grade austenitic stainless steel, titanium, and carbon fiber materials, setting a standard for excellence in the industry.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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