Does the Dinan X3 M40i exhaust fit both the X3 and X4?

Yes. It fits the G01 BMW X3 M40i and G02 BMW X4 M40i, both pre-LCI and LCI, from the 2018 through 2025 model years. Dinan includes the mounting hardware, clamps, and hangers needed for a direct bolt-on installation on either chassis with no cutting or welding required.

Is the exhaust valve still adjustable after installing the Dinan X3 M40i exhaust?

Yes. The factory-style valve control is fully retained, so the system still switches between a quiet cruise and a bolder, more aggressive tone. Owners who want manual control over the valve independent of the factory logic can pair the system with the separately sold Dinan exhaust valve remote.

How difficult is the Dinan X3 M40i exhaust to install?

Dinan rates it a Level-1 install at roughly 2.3 labor hours, using the factory mounting points with no cutting or welding required. The kit includes all clamps, hangers, and valve componentry needed for both pre-LCI and LCI G01 X3 M40i and G02 X4 M40i models.

What is the Dinan X3 M40i exhaust made from?

It is made from 100% T304 stainless steel, TIG-welded with no hydroformed piping, and finished with four individually functioning quad tips in black ceramic coating. The factory-style valve stays fully functional, so the system retains BMW's quiet and aggressive drive modes while opening up the tone and cutting weight versus stock.

How much horsepower does the Dinan X3 M40i exhaust add?

Dinan measured a peak gain of 6 hp and 5 ft-lb of torque at 6,600 rpm on the dyno. The larger 83mm pipe and single straight, unrestricted path free up exhaust flow versus the stock single-to-dual layout, and the gains come without giving up the factory exhaust valve's quiet mode.

Is the Dinan X3 M40i exhaust street legal, and is it covered by warranty?

Yes. It carries an Emissions Code 5 rating and is legal for street use in all 50 states, and Dinan backs its parts with a warranty program built with BMW of North America that can match up to four years or 50,000 miles of coverage, so adding it does not have to mean giving up factory-style protection.

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Description

Dinan Valved Cat-Back Exhaust with Black Tips for G01 / G02 BMW X3 M40i and X4 M40i

Dinan X3 M40i exhaust replaces the factory single-to-dual layout with one straight, unrestricted 83mm T304 stainless pipe, keeping the factory exhaust valve fully functional so the G01 X3 M40i and G02 X4 M40i can idle quietly in a neighborhood and open up on demand. Dinan removes the central resonator and collector, letting a Helmholtz-equipped muffler cancel highway drone rather than muting the exhaust note, and finishes the system with four individually functioning quad tips in black ceramic coating. Backed by Dinan’s warranty program, developed with BMW of North America to match up to four years or 50,000 miles of factory coverage, the upgrade adds power and sound without giving up warranty protection.

Design and Performance

The factory-style exhaust valve stays fully functional, opening and closing exactly as BMW intended, so the X3 M40i and X4 M40i stay quiet at a cruise and open up on demand. Dinan removes the factory’s central resonator and collector and replaces the stock single-to-dual pipe layout with one straight, unrestricted 83mm pipe, letting the Helmholtz-equipped muffler cancel drone at highway speed rather than muting the exhaust note. The result is the low, signature Dinan rumble layered under the B58’s factory character, backed by real dyno numbers.

Features

100% T304 stainless steel construction, TIG-welded, with no hydroformed piping
Four individually functioning quad tips, 3.75 inches, finished in black ceramic coating with a laser-engraved Dinan logo
Direct bolt-on design; no cutting or welding required
Level-1 install difficulty
Compatible with the Dinan exhaust valve remote for full manual valve control (sold separately)
50-state emissions legal: Emissions Code 5 rated

Specifications

Pipe diameter: 83mm (stock: 80mm)
Tip size: 3.75″ / 95mm, quad configuration
System weight: 53 lbs (stock system: 60 lbs)
Peak power gain: +6 hp at 6,600 rpm
Peak torque gain: +5 ft-lb at 6,600 rpm
Installation time: approximately 2.3 labor hours

Applications

BMW X3 M40i: G01 | 2018-2025 | 3.0L Turbo I6 B58
BMW X4 M40i: G02 | 2018-2025 | 3.0L Turbo I6 B58

Notes

A polished-tip version is available as Dinan part number D660-0099
Retains full BMW factory valve control and pairs with the Dinan exhaust valve remote for manual override (sold separately)
Rated Emissions Code 5 and legal for street use in all 50 states
Includes a printed installation guide and a laser-engraved Dinan logo on each tip

Frequently Asked Questions

Does the Dinan X3 M40i exhaust fit both the X3 and X4? Yes. It fits the G01 BMW X3 M40i and G02 BMW X4 M40i, both pre-LCI and LCI, from the 2018 through 2025 model years. Dinan includes the mounting hardware, clamps, and hangers needed for a direct bolt-on installation on either chassis with no cutting or welding required.
Is the exhaust valve still adjustable after installing the Dinan X3 M40i exhaust? Yes. The factory-style valve control is fully retained, so the system still switches between a quiet cruise and a bolder, more aggressive tone. Owners who want manual control over the valve independent of the factory logic can pair the system with the separately sold Dinan exhaust valve remote.
How difficult is the Dinan X3 M40i exhaust to install? Dinan rates it a Level-1 install at roughly 2.3 labor hours, using the factory mounting points with no cutting or welding required. The kit includes all clamps, hangers, and valve componentry needed for both pre-LCI and LCI G01 X3 M40i and G02 X4 M40i models.
What is the Dinan X3 M40i exhaust made from? It is made from 100% T304 stainless steel, TIG-welded with no hydroformed piping, and finished with four individually functioning quad tips in black ceramic coating. The factory-style valve stays fully functional, so the system retains BMW’s quiet and aggressive drive modes while opening up the tone and cutting weight versus stock.
How much horsepower does the Dinan X3 M40i exhaust add? Dinan measured a peak gain of 6 hp and 5 ft-lb of torque at 6,600 rpm on the dyno. The larger 83mm pipe and single straight, unrestricted path free up exhaust flow versus the stock single-to-dual layout, and the gains come without giving up the factory exhaust valve’s quiet mode.
Is the Dinan X3 M40i exhaust street legal, and is it covered by warranty? Yes. It carries an Emissions Code 5 rating and is legal for street use in all 50 states, and Dinan backs its parts with a warranty program built with BMW of North America that can match up to four years or 50,000 miles of coverage, so adding it does not have to mean giving up factory-style protection.

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.

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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Dinan Valved Cat-Back Exhaust with Black Tips for G01 / G02 BMW X3 M40i and X4 M40i [D660-0099-BLK]

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Dinan Valved Cat-Back Exhaust with Black Tips for G01 / G02 BMW X3 M40i and X4 M40i

Design and Performance

Features

Specifications

Applications

Notes

Frequently Asked Questions

About Dinan

Reviews