ARM Motorsport Resonated S55 Downpipe - F80 M3 | F82/F83 M4 | F87 M2C

Regular price $497.00
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-21 in stock



• Up to +30whp / 30wtq
• Enhanced Exhaust Note
• 304 Stainless Steel
• Improved Turbo Spool


The ARM F82 M4 Downpipes are the ultimate solution for improving power, throttle response, and exhaust note on your S55 powered M4 Our goal for the ARM M4 Downpipes was to provide a solution that would maximize power and torque, fit perfectly, and sound extraordinary.
Catless downpipes are considered a standard upgrade for any F82 M4 owner looking to safely push their S55 engine beyond basic Stage 1 tuning.  With Stage 2 and up tuning, higher boost increases back-pressure at the OEM catalysts and chokes the S55's turbochargers, causing them to work harder and shortening their life. 

The ARM F82 M4 Downpipes relieve the stressful back-pressure caused by high-boost tunes, allowing the exhaust to flow freely, increasing power and torque, all while extending the longevity of your S55's turbochargers.  On our test car, after installing our F80 downpipes and switching to a Stage 2 flash we made 539whp/544wtq, this is 68whp and a massive 127wtq gain over just the Stage 1 flash!

Even with the Resonated ARM F82 M4 Downpipes installed on your stock-tune S55, you will notice an increase in power, torque and responsiveness.  Not to mention the incredible, head-turning sounds your M4 will make under part and full throttle.


The ARM Resonated S55 Downpipes give your F82 M4 an unparalleled sound that even other M4 owners will notice.  The deep, aggressive tone of the ARM F82 M4 Resonated Downpipes will stand out next to the all too familiar high-pitched rasp of other catless downpipes.  Our 4" resonators are installed in the perfect location to enhance the sound of your S55 without compromising the precise fitment of our M4 downpipes.


Precision CNC machined v-band flanges offer a smooth transition of exhaust gasses from the the turbochargers to the ARM S55 Downpipes.  The body of the 3" ARM M4 Downpipes are constructed of SS304 Stainless-Steel and are threaded smoothly and perfectly though the space given by BMW towards the mid-pipe section.

Any downpipes that bolt up directly to the OEM mid-pipes must reduce to the 2.5"  to meet the size of the OEM mid-pipes.  Some aftermarket  downpipes use an abrupt, short reducer which causes turbulence in the exhaust gasses.  The ARM F82 M4 Downpipes feature a smooth, gradual transition from the 3" inlet to the 2.5" exit for optimum exhaust flow.  

The ARM M4 Downpipes are a massive improvement over the OEM S55 downpipes, with precise fitment and brilliant finish the ARM S55 Resonated Downpipes are the perfect solution for your S55 project. Our goal for the ARM F82 M4 Downpipes was to provide a solution that would maximize power/torque, fit perfectly, and sound uniquely extraordinary.  We are so confident that you'll agree we've achieved this, we back every set of our ARM F82 M4 Resonated Downpipes with a 30 Day Money-Back Guarantee and the ARM Lifetime Free-Replacement Warranty.


• ARM F80 M3 Resonated Downpipes
• CNC Machined Bracket for Front-Turbo Downpipe
• 4x Downpipe to Mid-Pipe Bolts/Nuts
• ARM Lifetime Replacement Warranty


Make Model Submodel Engine
BMW F80 M3 S55 3.0L
BMW F82 M4 S55 3.0L
BMW F83 M4 S55 3.0L
BMW F87 M2 Competition S55 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.

The most aggressive diffuser on the market.


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


Every piece of carbon fiber that leaves our location in Los Angeles, CA is quality checked extensively prior to shipment. Every piece is backed up by our fitment and finish guarantee.


At Horizon Motorsport our mission is to provide unparalleled customer service. 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.


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. Because of our unique insight into the BMW community, we choose to carry only the highest quality parts from the highest quality brands on the market.