Which BMW models does the Dinan 340i cold air intake fit?

The Dinan 340i cold air intake fits the B58-powered F30 BMW 340i, F22 M240i, and F32 440i (2016-2021), including the F31 and F34 340i, F23 M240i, and F33 and F36 440i body styles. All share the same B58 turbocharged inline-six.

Is this a closed or open intake?

This is a fully closed intake. The air box seals completely around the filter, isolating it from hot underhood air so the B58 draws cooler, denser air. Closed designs prioritize consistent intake temperatures and a quieter, more OEM-like character.

No tune is required to install the Dinan 340i cold air intake, and it improves airflow on its own. The largest, most repeatable gains come when the intake is combined with engine tuning, which lets the B58 take fuller advantage of the added flow.

Is the filter reusable?

Yes. The intake uses a washable, reusable high-flow cotton gauze filter that can be cleaned and re-oiled rather than replaced. The high-flow element supports the intake's added airflow while protecting the engine.

Is installation difficult?

No. The Dinan 340i cold air intake is a bolt-on installation using factory mounting points, with no cutting required. The kit includes the carbon fiber tube, closed air box, and filter needed to complete the swap.

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Description

Dinan Closed Carbon Fiber Cold Air Intake for F22 / F23 BMW M240i, F30 / F31 / F34 340i, and F32 / F33 / F36 440i

The Dinan 340i Cold Air Intake is a closed, carbon fiber induction system for the B58-powered F30 BMW 340i, F22 M240i, and F32 440i, along with their F31, F34, F23, F33, and F36 body styles. The fully closed air box seals the high-flow filter away from underhood heat while an optimized carbon fiber tube cuts restriction and feeds cooler, denser air to the turbo. The payoff is quicker throttle and turbo response with a clean, understated look under the hood. Finished in exposed carbon fiber with a closed air box.

Features

Larger volume air box (30% larger than stock) that completely seals for maximum insulation from power robbing heat
More Power: + 15hp @ 6000 RPM & + 13ft/lbs @ 6000 RPM (+ 13 WHP & + 11 WTQ) without additional modifications
50 State Emissions Legal (partial application list): CARB EO D-176-56 (2019-21 F2x/F3x M240i/340i/440i Only)
34% increase in filter area (stock: 76.3in², Dinan: 102.1in²) for optimum flow
Free flowing injection molded Air Mass Meter housing (8% larger then stock)
Optimized carbon fiber intake tube
Quick and easy installation
Improved throttle response
Sportier Sound

Specifications

Material: carbon fiber intake tube
Engine: 3.0L Turbo I6 B58
Air box: fully closed and sealed
Filter: washable, reusable high-flow cotton gauze
Intake style: closed

Applications

BMW M240i: F22 / F23 | 2016-2021 | 3.0L Turbo I6 B58
BMW 340i: F30 / F31 / F34 | 2016-2021 | 3.0L Turbo I6 B58
BMW 440i: F32 / F33 / F36 | 2016-2021 | 3.0L Turbo I6 B58

Frequently Asked Questions

Which BMW models does the Dinan 340i cold air intake fit? The Dinan 340i cold air intake fits the B58-powered F30 BMW 340i, F22 M240i, and F32 440i (2016-2021), including the F31 and F34 340i, F23 M240i, and F33 and F36 440i body styles. All share the same B58 turbocharged inline-six.
Is this a closed or open intake? This is a fully closed intake. The air box seals completely around the filter, isolating it from hot underhood air so the B58 draws cooler, denser air. Closed designs prioritize consistent intake temperatures and a quieter, more OEM-like character.
Does it need a tune? No tune is required to install the Dinan 340i cold air intake, and it improves airflow on its own. The largest, most repeatable gains come when the intake is combined with engine tuning, which lets the B58 take fuller advantage of the added flow.
Is the filter reusable? Yes. The intake uses a washable, reusable high-flow cotton gauze filter that can be cleaned and re-oiled rather than replaced. The high-flow element supports the intake’s added airflow while protecting the engine.
Is installation difficult? No. The Dinan 340i cold air intake is a bolt-on installation using factory mounting points, with no cutting required. The kit includes the carbon fiber tube, closed 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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