[{"id":136440086627,"handle":"all-products","updated_at":"2025-04-19T19:05:09-07:00","published_at":"2019-06-28T22:28:22-07:00","sort_order":"best-selling","template_suffix":"","published_scope":"global","title":"All Products","body_html":"All Mashimarho Products"},{"id":136440381539,"handle":"bmw","updated_at":"2025-04-19T20:00:07-07:00","published_at":"2019-06-28T22:41:57-07:00","sort_order":"best-selling","template_suffix":"","published_scope":"global","title":"BMW","body_html":"BMW Products","image":{"created_at":"2021-11-21T17:07:21-08:00","alt":null,"width":2208,"height":3330,"src":"\/\/mashimarho.com\/cdn\/shop\/collections\/IMG_1812_f75ca66b-02a9-4912-afcb-27d374d5f998.jpg?v=1637543241"}},{"id":262864666723,"handle":"bmw-g80-g82","updated_at":"2025-04-19T19:05:09-07:00","published_at":"2021-10-09T10:25:57-07:00","sort_order":"manual","template_suffix":"","published_scope":"global","title":"BMW G80\/G82 Parts","body_html":"Everything you can possibly need for the G80 and G82 will be here as we go.","image":{"created_at":"2021-11-21T17:04:51-08:00","alt":null,"width":512,"height":640,"src":"\/\/mashimarho.com\/cdn\/shop\/collections\/streetfighterla-007.jpg?v=1637543092"}},{"id":268082708579,"handle":"g8x-m3-m4","updated_at":"2025-04-19T19:05:09-07:00","published_at":"2022-11-23T10:23:29-08:00","sort_order":"manual","template_suffix":"","published_scope":"global","title":"G8X M3 M4","body_html":"G8X","image":{"created_at":"2022-11-22T23:13:51-08:00","alt":null,"width":2227,"height":1114,"src":"\/\/mashimarho.com\/cdn\/shop\/collections\/iris.jpg?v=1669187631"}},{"id":136464760931,"handle":"performance","updated_at":"2025-04-19T20:00:07-07:00","published_at":"2019-06-29T13:02:28-07:00","sort_order":"manual","template_suffix":"","published_scope":"global","title":"Performance","body_html":"","image":{"created_at":"2019-06-29T13:03:07-07:00","alt":null,"width":3600,"height":2400,"src":"\/\/mashimarho.com\/cdn\/shop\/collections\/734A7152.jpg?v=1731707617"}},{"id":262373408867,"handle":"performance-bolt-on-products","updated_at":"2025-04-18T22:30:01-07:00","published_at":"2021-09-02T19:32:41-07:00","sort_order":"manual","template_suffix":"","published_scope":"global","title":"PERFORMANCE BOLT-ONS","body_html":"","image":{"created_at":"2021-09-02T19:44:33-07:00","alt":null,"width":2624,"height":3936,"src":"\/\/mashimarho.com\/cdn\/shop\/collections\/IMG_3557.jpg?v=1630637144"}},{"id":263225081955,"handle":"our-personal-build-lists","updated_at":"2025-04-19T20:00:07-07:00","published_at":"2021-11-21T16:11:34-08:00","sort_order":"price-desc","template_suffix":"","published_scope":"global","title":"Products On Our Personal Builds","body_html":"Find your favorite Mashimarho builds here. Take on your favorite iconic build and apply it to your personal car. Most items are broken down and listed here. You'll find things we used previously and things that are currently on our vehicles.","image":{"created_at":"2021-11-21T16:33:03-08:00","alt":null,"width":3993,"height":4991,"src":"\/\/mashimarho.com\/cdn\/shop\/collections\/DSC09045.jpg?v=1637541184"}},{"id":262631096419,"handle":"new-products","updated_at":"2025-04-18T15:07:33-07:00","published_at":"2021-09-28T16:24:36-07:00","sort_order":"created-desc","template_suffix":"","published_scope":"global","title":"Recently Added Items","body_html":"View our most recently added products here!\u003cbr\u003eItem list cycles regularly"},{"id":173089488995,"handle":"vendor-wholesale","updated_at":"2025-04-19T20:00:07-07:00","published_at":"2021-08-02T16:02:54-07:00","sort_order":"best-selling","template_suffix":"","published_scope":"web","title":"SILVER","body_html":""}]
The ARM S58 4.5" Single Midpipe upgrade is designed to unleash the incredible exhaust sounds from your G8X M3/M4. By removing the secondary catalysts and two middle resonators, the ARM S58 Single Midpipe substantially improves the sound of your S58-powered BMW. Also, by retaining the OEM muffler, you still have the ability to control the exhaust valves, allowing you to close them for a more subtle tone for when you want to be quiet, or open the valves for maximum sound.
ENHANCE THE SOUND OF YOUR S58
The ARM S58 4.5" Single Midpipe will not only increase the overall volume of your exhaust but also transform the sound into something truly unique from an ordinary G80 M3. It will also make the exhaust burbles more audible even with OEM tuning. The G82 M4 in the video below is equipped with both the ARM S58 Single Midpipe and ARM S58 Downpipes. Pairing the ARM S58 Single Midpipe with the ARM S58 Downpipes will increase the overall volume of your S58 even more than the S58 Single Midpipe alone.
CONSTRUCTION
The ARM S58 Midpipe is a 4.5" design from the downpipe connection all the way to the rear section where it will reduce to 2.75" to perfectly connect to the OEM muffler section. The ARM S58 Single Midpipe starts with an OEM-style 2-Bolt flange which can mate up to either the OEM downpipes, or upgraded downpipes that fit the OEM exhaust. These flanges will accommodate the OEM midpipe gasket perfectly.
The ARM S58 Single Midpipe then transitions to the 4.5" Midpipe section of the exhaust via the slip-fit connections. Where the exhaust merges is the heart of the ARM S58 Single Midpipe. You have the 4.5" Single Midpipe section, this is where the magic happens. The sound waves of each bank of your S58 engine are combined to produce a much deeper and richer exhaust note.
From the X-Pipe section the ARM S58 Midpipe upgrade transitions back to the OEM muffler, which allows full use of the OEM exhaust valves. This gives you the freedom to choose between open and closed exhaust flaps, controlling the volume your G80 M3/M4 produces. To get a look to match your ARM S58 Midpipe check out theARM S58 Exhaust Tips.
From the middle midpipe section, the ARM S58 4.5" Single Midpipe transitions back to the OEM muffler, which allows full use of the OEM exhaust valves. This gives you the freedom to choose between open and closed exhaust flaps, allowing you to control the volume your G80 M3/M4 produces. Upgrade the look of your G8X to match the sound of your ARM S58 Midpipe by completing the kit with a set of ARM S58 Exhaust Tips.
The ARM S58 Midpipe will secure to the exhaust hanger on the passenger's side using the OEM style mounting bracket. This helps the exhaust secure during aggressive driving.
AXLE BACK ADAPTERS
The ARM S58 Axle Back Adapters are designed to reduce down at the end of the midpipe to fit most aftermarket axle back systems. Most aftermarket axle back systems reduce down from 3" (76mm) to 2.75" (70mm) and that's where the ARM S58 Axle Back Adapters join the two separate components.
IN THE BOX
• 2x ARM Downpipe Gaskets • 1x ARM Extended Brace • 2x Front 4.5" Midpipe Sections • 2x Rear Exhaust Sections • 5x ARM Clamps
FITMENT GUIDE
Make
Model
Submodel
Engine
BMW
G80
M3
S58 3.0L
BMW
G80
M3 Competition xDrive
S58 3.0L
BMW
G82
M4
S58 3.0L
BMW
G82
M4 Competition xDrive
S58 3.0L
BMW
G83
M4
S58 3.0L
BMW
G83
M4 Competition xDrive
S58 3.0L
ARM MOTORSPORTS LIFETIME WARRANTY
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 forOff-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.
