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.
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.
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.
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 |
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 | F33 | 440i | B58 3.0L |
BMW | F33 | 440i xDrive | B58 3.0L |
BMW | F34 | 340i xDrive | B58 3.0L |
BMW | F36 | 440i | B58 3.0L |
BMW | F36 | 440i xDrive | B58 3.0L |
BMW | G30 | 540i | B58 3.0L |
BMW | G30 | 540i xDrive | B58 3.0L |
BMW | G32 | 640i | B58 3.0L |
BMW | G32 | 640i xDrive | B58 3.0L |
BMW | G12 | 740i | B58 3.0L |
BMW | G12 | 740i xDrive | B58 3.0L |
BMW | G15 | 840i | B58 3.0L |
BMW | G15 | 840i xDrive | B58 3.0L |
TOYOTA | A90 | Supra | B58 3.0L |
TOYOTA | A91 | Supra | B58 3.0L |
Shipping was super fast. Price was the best I could find for any downpipe. Fits perfect and sounds great. Extra power is amazing. Highly recommend!
Overall buying from the website was nice and easy. Shipping was super fast! Product came with stickers and installation instructions. Very satisfied!
This downpipe fit flawlessly. There weren’t any issues with alignment from the turbo to the exhaust. The slip on fitment from the end of the downpipe that meets the rest of the stick exhaust was perfect. It slipped right in and no exhaust leaks. I was a little skeptical of the product initially but would 10/10 buy again. The flex portion was actually able to move as well. Car previously had a CTS Turbo catted Downpipe and the fit was nothing compared to this. And car sounds Amazing. Worth every penny.
Dude, this downpipe sounds way to good. Amazing results. Sounds also sound excellent! Definitely worth it. Going towards catless 100%
Great looking and quality catless downpipe, straight forward and easy install, 10 out of 10 would recommend!
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