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PROFILE

The ARM B58 Downpipe is one of the foundational upgrades for giving your B58-powered BMW more power, torque, and sound.  The stock B58 downpipe comes from the factory with a catalyst that severely restricts exhaust flow, causing excessive backpressure with increased boost.  Upgrading your downpipe unlocks power, improves turbo spool, allows you to safely run stage 2+ tuning, all while increasing the sound of your B58-powered BMW.   

ENHANCE THE SOUND OF YOUR B58

CONSTRUCTION

The ARM B58 Downpipe is built with SS304 stainless steel and backed by the ARM Motorsports Lifetime Warranty.  The ARM B58 Downpipe starts with a 4.5" diameter precision CNC machined turbo v-band flange. 

The ARM B58 Downpipe then gradually reduces to a 3.1" diameter before the flex section.  The flex section is incorporated into the ARM B58 Downpipe to relieve stress on the turbo during aggressive driving.

The ARM B58 Downpipe is further secured by the 2-bolt bracket which utilizes the OEM downpipe mounting points.

The 3.1" diameter continues after the flex section to allow for an easy installation to the OEM midpipe, or any midpipe that connects to the OEM B58 downpipe.    

The ARM B58 Downpipe features two O2 sensor bungs to allow for reinstallation of the OEM oxygen sensors.  The O2 sensor bungs are located closer to the turbo on the ARM downpipe to avoid stretching the O2 sensor wires during installation.  A tune or CEL Delete will be required to avoid a check engine light from displaying on instrument panel.

FLASHING STAGE 2+

 By improving the exhaust flow on your B58 BMW with the ARM B58 Downpipe, you're prepared for the higher boost tunes.  If you already have a software program for your B58 chances are these tune files are already pre-loaded into your software waiting for you to flash after your downpipe is installed.  Most tunes require an upgraded downpipe to run properly.

IN THE BOX

FITMENT GUIDE

The items installed or applied to vehicles are intended strictly foroff-road use onlyandtrack vehicles. These modifications may not comply with emissions, safety, or environmental regulations required for public road use underEnvironmental Regulatory Agency (ERA)laws. It is the sole responsibility of the vehicle owner or operator to ensure adherence to all applicable local, state, and federal regulations. Use on public roads may result in legal penalties or vehicle impoundment. Always verify compliance with local authorities before installation.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

If you're unsure whether a part will fit your vehicle, feel free tocontact us herewith your inquiry. Our helpful sales team will reach out to confirm if it's the right match for you.

We offer a flat-rate shipping fee across thecontinental United States. This excludes Alaska, Hawaii, and U.S. territories. For international orders, additional shipping costs will apply. Please contact us for a quote if you are outside the continental U.S.

Also, feel free to also contact us at ColoradoN5X@Gmail.Com for any other questions.

Not all items are covered by warranty. Items including warranty, will clearly state that there is warranty within the product description. Most of these items will be a standard 1-year warranty against manufacture defects. You, the customer, will be responsible for shipping and handling. We will fix/replace that item with a product that is in working condition if you meet the warranty criteria. Please note that you will be allowed ONLY 1 claim within the year for that product. ColoradoN5X is not responsible for any damage caused during the installation of our products.