Does the Dinan X3 M40i cold air intake fit the X4 M40i?

Yes. The Dinan X3 M40i cold air intake fits the G01 BMW X3 M40i and the G02 X4 M40i (2020-2025), both built on the B58 turbocharged inline-six. It is designed for the M40i models specifically and shares the same B58 intake tract.

How much more air does it flow?

The Dinan intake flows about 7 percent more than stock (589 CFM versus 458 CFM at 24 inches of water), helped by a 66 percent larger sealed air box and a 44 percent larger filter. That added breathing improves throttle and turbo response for quicker acceleration.

Is the filter washable?

Yes. The system uses a high-flow pleated cotton gauze filter that is washable and reusable, so it can be cleaned and re-oiled rather than replaced. The larger 82 square inch filter area supports the intake's higher airflow.

Does it change the sound?

Yes. The semi-open design gives a more pronounced, sporty intake tone under throttle compared to the muted factory setup, while the carbon fiber tube keeps the underhood look clean. It is louder than stock without being intrusive at a cruise.

Is it a difficult install?

No. The Dinan X3 M40i cold air intake is a quick, bolt-on installation using factory mounting points, with no cutting required. The kit includes the carbon fiber tube, sealed air box, and filter needed to complete the swap.

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Description

Dinan Carbon Fiber Cold Air Intake for G01 / G02 BMW X3 / X4 M40i

Dinan X3 M40i intake is a carbon fiber, semi-open induction system for the G01 BMW X3 M40i and G02 X4 M40i, both running the B58 turbocharged inline-six. Dinan opens up the factory intake with a 66 percent larger air box (from 150 to 250 cubic inches), a 44 percent larger filter, and an optimized carbon fiber tube that flows about 7 percent more air, eliminating the upper intake resonator for a more direct path. The result is quicker throttle and turbo response with a more pronounced, sporty intake note from the semi-open design, finished in exposed carbon fiber.

Features

Improved throttle and turbo response compared to stock, resulting in quicker acceleration
66% larger volume air box (stock: 150 in³, Dinan: 250 in³) for increased breathability
Flows 7% more than stock (stock: 458 CFM, Dinan: 589 CFM at 24 inches of H2O)
44% increase in filter area (stock: 57 in², Dinan: 82 in²) for optimum flow
Washable and reusable high-flow pleated cotton gauze filter
A pronounced, sporty sound courtesy of the semi-open design
Optimized carbon fiber intake tube with less restriction
Eliminates the upper intake resonator
Quick and easy installation

Applications

BMW X3 M40i: G01 | 2020-2025 | 3.0L Turbo I6 B58
BMW X4 M40i: G02 | 2020-2025 | 3.0L Turbo I6 B58

Notes

Washable, reusable filter. Quick bolt-on install using factory mounting points, no cutting required.

Frequently Asked Questions

Does the Dinan X3 M40i intake fit the X4 M40i? Yes. The Dinan X3 M40i intake fits the G01 BMW X3 M40i and the G02 X4 M40i (2020-2025), both built on the B58 turbocharged inline-six. It is designed for the M40i models specifically and shares the same B58 intake tract across both vehicles.
How much more air does the Dinan X3 M40i intake flow? The Dinan X3 M40i intake flows about 7 percent more than stock (589 CFM versus 458 CFM at 24 inches of water), helped by a 66 percent larger sealed air box and a 44 percent larger filter. That added breathing improves throttle and turbo response for quicker acceleration.
Is the filter on the Dinan X3 M40i intake washable? Yes. The system uses a high-flow pleated cotton gauze filter that is washable and reusable, so it can be cleaned and re-oiled rather than replaced. The larger 82 square inch filter area supports the intake’s higher airflow.
Does the Dinan X3 M40i intake change the sound? Yes. The semi-open design gives a more pronounced, sporty intake tone under throttle compared to the muted factory setup, while the carbon fiber tube keeps the underhood look clean. It is louder than stock without being intrusive at a cruise.
Is the Dinan X3 M40i intake a difficult install? No. The Dinan X3 M40i intake is a quick, bolt-on installation using factory mounting points, with no cutting required. The kit includes the carbon fiber tube, sealed air box, and filter needed 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.

Additional Information

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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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