What does the Dinan M340i axle-back exhaust fit?

The Dinan M340i axle-back exhaust fits the G20 BMW M340i and G22, G23, and G26 M440i (2020-2024) with the B58 turbocharged inline-six. It bolts to the factory mounting points, replacing the rear section of the exhaust for a louder, fuller note.

What finish are the tips on the Dinan M340i axle-back exhaust?

This version uses black ceramic clamp-on tips. The system is 100% T304 stainless steel, TIG-welded and brush-finished for a clean, corrosion-resistant appearance at the rear of the car.

Does the Dinan M340i axle-back exhaust add power?

An axle-back exhaust is chosen mainly for sound and styling. The Dinan M340i axle-back exhaust reduces backpressure through the rear section, delivering max gains of 6 hp and 5 ft-lb at 6,600 rpm; the primary benefit is the improved note and appearance.

Is the Dinan M340i axle-back exhaust difficult to install?

No. The Dinan M340i axle-back exhaust is a bolt-on installation using the factory mounting points, with no cutting or welding required. Mounting hardware is included to complete the swap.

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Description

Dinan Free Flow Axle-Back Exhaust with Black Tips for G20 BMW M340i and G22 / G23 / G26 M440i

The Dinan M340i Axle-Back Exhaust is a T304 stainless steel free-flow axle-back exhaust for the G20 BMW M340i and G22, G23, and G26 M440i and their B58 turbocharged inline-six. The free-flow rear section reduces backpressure for a louder, fuller note than the muted factory setup, capped with black ceramic clamp-on tips. TIG-welded and brush-finished throughout. Finished with black ceramic tips.

Features

Stock exhaust valve actuator reused, and another valve/actuator added to the opposing side promoting even flow regardless of valve position
Computer-controlled exhaust valves are retained and limit noise during low-speed driving and open fully during high-load conditions
Twin exhaust valves are a whopping 76mm diameter, making them 30% less restrictive than the OE valves
Quad 4″ diameter clamp-on, double-walled, ceramic black and laser engraved exhaust tips
Easy bolt-on installation with included mounting hardware
Larger diameter piping for increased flow (76mm vs 70mm)
More Power: + 6hp @ 6600 RPM, + 5ft/lbs @ 6600 RPM
100% 304 stainless steel construction
4lbs lighter than the stock system
Enjoyably louder, sportier sound
Direct bolt-on to factory mounting points

Applications

BMW M340i: G20 | 2020-2024 | 3.0L Turbo I6 B58
BMW M440i: G22 / G23 / G26 | 2021-2024 | 3.0L Turbo I6 B58

Notes

A polished-tip version is available as Dinan part number D660-0085

Frequently Asked Questions

What does the Dinan M340i Axle-Back Exhaust fit? The Dinan M340i Axle-Back Exhaust fits the G20 BMW M340i and G22, G23, and G26 M440i (2020-2024) with the B58 turbocharged inline-six. It bolts to the factory mounting points, replacing the rear section of the exhaust for a louder, fuller note.
How much louder is it? The Dinan M340i Axle-Back Exhaust uses a free-flow design that reduces backpressure for a louder, fuller note than the muted factory system, while staying civil during normal cruising.
What finish are the tips? This version uses black ceramic clamp-on tips. The system is 100% T304 stainless steel, TIG-welded and brush-finished for a clean, corrosion-resistant appearance at the rear of the car.
Does it add power? An axle-back exhaust is chosen mainly for sound and styling. The Dinan M340i Axle-Back Exhaust reduces backpressure, which can free up a small amount of power, but the primary benefit is the improved note and appearance.
Is installation difficult? No. The Dinan M340i Axle-Back Exhaust is a bolt-on installation using the factory mounting points, with no cutting or welding required. Mounting hardware is included to complete the swap.

About Dinan

Founded in 1979, Dinan is North America’s leading BMW tuner, developing, manufacturing, and marketing a full line of high-performance products for BMW, MINI, and Mercedes-Benz. Dinan works through a nationwide network of Authorized Dinan Performance Centers, including select BMW dealerships and independent BMW service and performance shops. The company’s warranty program, introduced in 1996 with BMW of North America’s cooperation, matches BMW’s new car warranty and covers Dinan enhancements and the vehicle itself for up to 4 years or 50,000 miles. That coverage lets BMW owners add real performance without risking their factory warranty. Automotive publications have tested Dinan-enhanced BMWs against some of the world’s most exotic sports cars for three decades, and the results consistently hold up. Despite that performance, Dinan BMWs keep the reliability and everyday civility BMW owners expect. The product line spans engine, driveline, and chassis components across the full BMW lineup, covering acceleration, cornering, and stopping power. Every Authorized Dinan Performance Center can help build anything from a single upgrade to a complete Dinan BMW.

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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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