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• Improved Exhaust Note
• Lighter Than OEM by 20+LBS
• Maintains OEM Muffler
• SS304 Stainless Steel
• Smooth Mandrel Bent Tubing



The ARM M240i Midpipe significantly improves the sound of your B58, giving it the aggressive exhaust note you're looking for from a tuned B58-powered BMW. Designed to amplify the power and sound of your B58, the ARM M240i Midpipe eliminates the two central resonators found in the stock M240i midpipe.  By retaining the OEM muffler you still have the ability to control the volume of your exhaust.  Switch your car into Sport Plus and enjoy the sounds of the upgraded B58 sing, or flip it into comfort mode to drive through the neighborhood.  You can select the ARM Single Exit Exhaust option to turn your ARM M240i Midpipe into a full 3.25" straight-piped system, for maximum volume and weight savings.


Designed in house and tested on our own M240i, the ARM M240i Midpipe will allow for perfect fitment, sitting well within the recess for the exhaust underneath the vehicle. It has also been engineered to sit at or above any other portions of the car, giving you adequate clearance, even if you're on a lowered suspension.

M240i Midpipe

The ARM M240i Midpipe is designed to fit either the OEM downpipe, or any upgraded downpipe that fits the OEM midpipe.  The ARM M240i Midpipe utilizes the OEM midpipe mounting location to secure the midpipe during aggressive driving.  

M240i Midpipe

The ARM M240i Midpipe is comprised of two sections, the longer front section and the shorter rear section.  The two sections of the ARM M240i Midpipe are joined with a slip-fit style connection and high quality performance-grade exhaust clamps.  The ARM M240i Midpipe upgrade deletes the two OEM resonators opening up the sound of your B58. 

M240i Midpipe

The ARM M240i Midpipe utilizes a full 3.25” system throughout, from the downpipe all the way to the muffler. If you replace the entire OEM set up with the ARM M240i Single Exit Exhaust you will save over 20lbs!


• 1x ARM B58 Midpipe Front Section
• 1x ARM B58 Midpipe Rear Section
• 4x Exhaust Clamps
• 1x ARM Single Exit Exhaust (Optional)



Make Model Submodel Engine
BMW F22 M240i B58 3.0L
BMW F22 M240i xDrive B58 3.0L
BMW F23 M240i B58 3.0L
BMW F23 M240i xDrive B58 3.0L


Every ARM Motorsports product is backed by a lifetime warranty which is automatically issued at the time of purchase. Your warranty protects you against any defects in craftsmanship or fitment. The warranty entitles you to a replacement unit.

This product is for Off-Road Use Only. Items sold for off-road use only are illegal to use on public roads in most states and provinces. This product is intended for racing vehicles which may never be used on a public road.

Horizon Motorsport has one goal: to make our clients happy. We aim to provide the highest level of customer service and the highest caliber parts, all at the most competitive prices. Have a question or concern about a product we sell? Send us an email at sales@horizonmotorsport.com.


Orders typically ship in 1-2 business days from our location in Los Angeles, CA. Transit time usually ranges from 3-5 business days, depending on where you are located. We offer worldwide shipping, if you need live outside of North America, shoot us an email and we would be happy to give you a quote!

Creating life-long customers.

As a small business we pride ourselves on creating long lasting relationships with our customers who know that they can count on us for any of their BMW needs. At Horizon Motorsport our mission is to provide a unparalleled customer experience to keep our customers coming back.

A Company Owned By Fellow Enthusiasts.

Horizon Motorsport was founded in 2019 in Los Angeles, CA by fellow BMW enthusiasts. We have experience with nearly all makes and models and have been actively involved in the Southern California BMW scene for over 3 years. Our unique insight and experience with the BMW community and other high end European-oriented brands gives us the knowledge and ability to stock only the highest quality parts from the highest quality brands.