The M340i is an impressive car in terms of performance and style but that is not conveyed when viewing its lackluster stock intake system. In stock trim, the M340i comes with a dry and lifeless air box housing a basic panel filter that is also accompanied by an intake resonator whose job it is to eliminate turbo/intake noises. The same noises that those in the performance world relish. Essentially BMW has seen fit to give M340i owners an air box that looks uninspiring, flows adequately but not ideally, and emits no noise. The exact opposite of what the platform exudes otherwise. The Dinan carbon fiber intake for the platform rights these wrongs and delivers a semi-open intake capable of flowing 58% more air than the stock system resulting in additional top end power and increased throttle response. At the same time revealing a more aggressive, sporty carbon fiber appearance, and an increase in sound courtesy of the removal of the intake resonator and implementation of a semi-open design. In order to achieve the gains in flow that set the Dinan intake system apart, the entire lower box of the system, and not just the lid, has been reworked and enlarged in an effort to make use of as much of the available real estate as possible within the engine bay. In turn, this allows a 40% larger, custom, free flowing filter to be housed within and maximum flow to be realized. However, a secondary inlet has always been desired by Dinan in order to effectively fill the volume of the enlarged air box and increased filter surface area. This desire led to a multitude of experiments being conducted on the effectiveness of a possible open-air inlet in the system. With different shapes, locations, and sizes of openings being tested, the goal was to ensure that the added secondary inlet did not cause any unwarranted side effects such as an increase in air temps in the system. This is commonplace with open-air intake systems where overheated engine bay air is employed in the intake tract. The results of these tests showed that the patterned openings present in the final iteration of the box located on the opposite side from the engine provided a perfect balance of additional volume to assist the factory inlet all the while not causing an increase in turbo inlet temperatures. This was the case regardless of testing conditions (single/multiple gear pulls, constant speed, 0-100mph runs, etc.). With more air being pulled into the system, throttle response is improved and additional power is realized in the form of max gains of +9 WHP / +8 ft-lbs of torque. The secondary air inlets also allow the intake system to be more audible so the turbo spool and BOV can be appreciated. A stark difference from Dinan's traditional fully sealed systems where induction noise is not nearly as recognizable. Not to be outdone by the increased power and sound, the outwardly visible system is made of immaculate carbon fiber so the under the hood appeal is vastly improved over its drab and utilitarian beginnings. A worthy piece to add to an already impressive vehicle.
More Power: Max gains of 9 WHP and 8 lb-ft of torque @ 6500 RPM on a completely stock vehicle.
Enjoyably louder, sportier sound.
Improved throttle response
Outflows factory intake by 58% or more.
Larger volume air box (60% larger than stock).
40% increase in filter area (stock: 82 in², Dinan: 115 in²) for optimum flow.
Quick and easy installation
Flow Bench Testing
The Dinan Intake System dramatically out performs the factory intake and improves upon the stock closed box design with our own semi-open one. The Dinan Intake System is at least 58% less restrictive compared to the factory intake.. By allowing the engine to breathe, the intake system lowers the intake air temperature, and allows for performance gains upwards of 9 WHP on a completely stock vehicle.
The M340i is an impressive car in terms of performance and style but that is not conveyed when viewing its lackluster stock intake system. In stock trim, the M340i comes with a dry and lifeless air box housing a basic panel filter that is also accom...
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A Premiere BMW Tuner
Founded in 1979, Dinan is well established as North America’s premiere BMW tuner. Dinan develops, manufactures and markets a comprehensive line of high performance products and systems, distributed through a nationwide network of Authorized Dinan BMW Performance Centers that includes select BMW Dealerships and Independent BMW Service/High Performance facilities.Dinan’s industry leading warranty program, quality products and solid engineering have helped to make Dinan an almost household word among BMW driving enthusiasts. Road tests conducted by major automotive enthusiast publications over the last 30 years place Dinan enhanced BMWs on a performance level with some of the most exotic sports cars in the world. At the same time, Dinan BMWs are widely renowned for being civilized and reliable, providing a high performance BMW-like driving experience without equal.
Dinan’s comprehensive warranty program, introduced in 1996 with the cooperation of BMW of North America, provides BMW owners with matching coverage to that offered by BMW’s new car warranty, ensuring that Dinan performance enhancements and the BMW they have been installed in are covered for up to 4 years or 50,000 miles. BMW automobiles can now be performance-tuned without the associated concern of negatively affecting the new car warranty coverage, making the idea of enhanced driving fun and excitement appealing to a rapidly growing number of BMW drivers. In addition, Dinan Certified Pre-Owned high performance BMWs are now available through participating Dinan Authorized BMW Dealerships, offering matching warranty coverage to BMW's program.
Dinan is also now expanding its offerings to include the popular MINI models, providing the same attention to detail, solid engineering, warranty and performance that have made Dinan widely regarded as the top BMW tuner in North America.Dinan offers a broad range of BMW performance products from engine, driveline and chassis tuning components to complete Dinan Signature Vehicles and special Factory Works programs. As a serious BMW Tuner, Dinan's objective is to offer complete performance solutions for the entire range of BMW models. We believe that every BMW driver deserves the opportunity to get the most from their car. From faster acceleration to improved cornering capabilites and stopping power, Dinan takes the guess-work out of creating the high performance BMW of the enthusiasts dreams with compete, balanced performance systems.
A Premiere BMW Tuner
Founded in 1979, Dinan is well established as North America’s premiere BMW tuner. Dinan develops, manufactures and markets a comprehensive line of high performance products and systems, distributed through a nationwide network ...
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