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



The ARM 340i 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 340i Midpipe eliminates the two central resonators found in the stock 340i 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. 


The ARM 340i 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 340i Midpipe is designed to fit either the OEM downpipe, or any upgraded downpipe that fits the OEM midpipe.  The ARM 340i Midpipe utilizes the OEM midpipe mounting location to secure the midpipe during aggressive driving.  

M240i Midpipe

The ARM 340i Midpipe is comprised of two sections, the longer front section and the shorter rear section.  The two sections of the ARM 340i Midpipe are joined with a slip-fit style connection and high quality performance-grade exhaust clamps.  The ARM 340i Midpipe upgrade deletes the two OEM resonators opening up the sound of your B58. 

M240i Midpipe

The ARM 340i Midpipe utilizes a full 3.25” system throughout, from the downpipe all the way to the muffler. 


• 1x ARM B58 Midpipe Front Section
• 1x ARM B58 Midpipe Rear Section
• 4x Exhaust Clamps



Make Model Submodel Engine
BMW F30 340i B58 3.0L
BMW F30 340i xDrive
B58 3.0L
BMW F32 440i B58 3.0L
BMW F32 440i xDrive
B58 3.0L
BMW F34 340i Gran Turismo B58 3.0L
BMW F34 340i Gran Turismo xDrive B58 3.0L
BMW F36 440i Gran Coupe B58 3.0L
BMW F36 440i Gran Coupe 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.

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