What does the Dinan 340i High Flow Mid-Pipe fit?

The Dinan 340i High Flow Mid-Pipe fits the F30 BMW 340i and F32 440i (2016-2020) with the B58 turbocharged inline-six. It is a direct bolt-on to the factory mounting points for the section it replaces.

The Dinan 340i High Flow Mid-Pipe uses mandrel-bent 3.25 in tubing to cut restriction versus the factory section, improving exhaust flow and letting more sound through. On turbocharged engines this can reduce backpressure for a small power gain.

The Dinan 340i High Flow Mid-Pipe is made from 100% T304 stainless steel and TIG-welded, so it resists corrosion and holds up to exhaust heat. Mandrel bends keep the tubing's full diameter through each curve for smoother flow.

Do I need other parts?

The Dinan 340i High Flow Mid-Pipe replaces the mid-section of the exhaust and pairs with a Dinan axle-back or the factory rear section. Confirm your existing exhaust setup so the connections match before installing.

Is installation difficult?

No. The Dinan 340i High Flow Mid-Pipe is a bolt-on installation using the factory mounting points, with no cutting or welding required. Mounting hardware is included to complete the swap.

Description

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Description

Dinan High Flow Mid-Pipe 3.25in for F30 BMW 340i and F32 440i

Dinan 340i mid-pipe is a T304 stainless steel high-flow mid-pipe for the F30 BMW 340i and F32 440i and their B58 turbocharged inline-six. It replaces the restrictive factory section with mandrel-bent 3.25″ tubing, deleting both resonators between the catalyst and rear muffler to improve exhaust flow and free up sound, TIG-welded from 100% 304 stainless for a clean, durable finish. It comes in 3lbs lighter than the stock section and bolts on directly using the factory mounting points with included hardware.

Features

Stock hydro-formed 80mm piping is replaced by 3.25″ (82.6mm) mandrel-bent piping for free flow
Deletes both resonators between the catalyst and the rear muffler
Weight savings over stock (stock: 24lbs, Dinan: 21lbs)
100% T304 stainless steel construction
TIG-welded for a clean, durable finish
Includes mounting hardware
Bolt-on installation

Applications

BMW 340i: F30 | 2016-2020 | 3.0L Turbo I6 B58
BMW 440i: F32 | 2016-2020 | 3.0L Turbo I6 B58

Notes

Deletes both factory resonators for increased volume. Direct bolt-on to factory mounting points; hardware included.

Frequently Asked Questions

What does the Dinan 340i mid-pipe fit? The Dinan 340i mid-pipe fits the F30 BMW 340i and F32 440i from 2016 through 2020 with the B58 turbocharged inline-six. It is a direct bolt-on to the factory mounting points for the section it replaces, and it fits both RWD and xDrive models. It is designed for the F30 sedan and F32 coupe; confirm your chassis if you have the F31 wagon, F34 Gran Turismo, or F33/F36 body styles before ordering.
How does the Dinan 340i mid-pipe help? The mid-pipe replaces the stock hydro-formed 80mm piping with mandrel-bent 3.25″ (82.6mm) tubing and deletes both factory resonators, cutting restriction and letting more sound through. On the turbocharged B58 this reduces backpressure for a small power gain and delivers a louder, fuller tone. It also comes in 3 lbs lighter than the stock section.
What is the Dinan 340i mid-pipe made of? The Dinan 340i mid-pipe is made from 100% T304 stainless steel and is TIG-welded, so it resists corrosion and holds up to exhaust heat. Mandrel bends keep the tubing’s full 3.25″ diameter through each curve for smoother flow than the stock hydro-formed piping.
Do I need other parts with the Dinan 340i mid-pipe? The Dinan 340i mid-pipe replaces the mid-section of the exhaust and pairs with a Dinan axle-back or the factory rear section. Confirm your existing exhaust setup so the connections match before installing; the pipe is designed to integrate with the factory rear or a compatible aftermarket rear section.
Is the Dinan 340i mid-pipe difficult to install? No. The Dinan 340i mid-pipe is a bolt-on installation using the factory mounting points, with no cutting or welding required. Mounting hardware is included to complete the swap, though professional installation is recommended for the best fit and alignment.

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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