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Description
B58 Charge Pipe For Gen 1 BMW M240I, 340i, 440i, 540i, 640i, 740i, X3, X4 - ARM MotorsportsThe ARM B58 Charge Pipe is a bulletproof charge pipe replacement for the plastic OEM B58 charge pipe. The ARM B58 Charge Pipe increases the diameter over the OEM charge pipe, resulting in increased airflow from the turbo to the engine, and improved throttle response. Upgrading the charge pipe on your B58 is one of the basic steps in ensuring your B58 is protected against a charge pipe failure. In addition to making sure you have a reliable means of
The ARM B58 Charge Pipe is a bulletproof charge pipe replacement for the plastic OEM B58 charge pipe. The ARM B58 Charge Pipe increases the diameter over the OEM charge pipe, resulting in increased airflow from the turbo to the engine, and improved throttle response. Upgrading the charge pipe on your B58 is one of the basic steps in ensuring your B58 is protected against a charge pipe failure. In addition to making sure you have a reliable means of transporting the charge air from the turbo to the throttle body, the ARM B58 Charge Pipe comes with Tri-Port capability giving you 3 options for tapping into the charge pipe for meth, boost, or nitrous.
CONSTRUCTION
The ARM B58 Charge Pipe starts at the turbo with a CNC machined fitting which seals tightly at the turbocharger outlet port. It then transitions to the mandrel bent 2.5" piping for smooth transitions and to match the turbo outlet.
The 6 layer reinforced silicone coupler connects the 2.5" piping to the larger 3" upper charge pipe section. This runs all the way to the CNC 3-bolt throttle body flange. The silicone coupler is secured using our constant tension T-bolt clamps to ensure that the connection doesn't loosen over time. The upper charge pipe incorporates machined connections for the temperature and MAP sensors to ensure a precise fit.
The ARM B58 Charge Pipe incorporates Tri-Port 1/8" NPT bungs. These 3 bungs are useful for running a heavy dose of methanol injection, tapping in for secondary boost gauge, nitrous injection, or anything else your heart desires! More ports means more options, and with the ARM charge pipe you have 3.
IN THE BOX
The 6 layer reinforced silicone coupler connects the 2.5" piping to the larger 3" upper charge pipe section. This runs all the way to the CNC 3-bolt throttle body flange. The silicone coupler is secured using our constant tension T-bolt clamps to ensure that the connection doesn't loosen over time. The upper charge pipe incorporates machined connections for the temperature and MAP sensors to ensure a precise fit.
The ARM B58 Charge Pipe incorporates Tri-Port 1/8" NPT bungs. These 3 bungs are useful for running a heavy dose of methanol injection, tapping in for secondary boost gauge, nitrous injection, or anything else your heart desires! More ports means more options, and with the ARM charge pipe you have 3.
IN THE BOX
• ARM B58 Lower Charge Pipe
• ARM B58 Upper Charge Pipe
• ARM Silicone Coupler
• ARM Constant Tension T-Bolt Clamps
• ARM B58 Upper Charge Pipe
• ARM Silicone Coupler
• ARM Constant Tension T-Bolt Clamps
HIGHLIGHTS
• Increased 3" Diameter
• Tri-Port NPT
• CNC Machined Fittings
• Mandrel Bent T6061 Aluminum
• Tri-Port NPT
• CNC Machined Fittings
• Mandrel Bent T6061 Aluminum
FITMENT GUIDE
The ARM B58 Charge Pipe is for Gen 1 B58 engines only found in the vehicles below.
| Make | Model | Submodel | Engine |
|---|---|---|---|
| BMW | F22 | M240i | B58 |
| BMW | F22 | M240i xDrive | B58 |
| BMW | F23 | M240i | B58 |
| BMW | F23 | M240i xDrive | B58 |
| BMW | F30 | 340i | B58 |
| BMW | F30 | 340i xDrive | B58 |
| BMW | F32 | 440i | B58 |
| BMW | F32 | 440i xDrive | B58 |
| BMW | F33 | 440i | B58 |
| BMW | F33 | 440i xDrive | B58 |
| BMW | F34 | 340i xDrive | B58 |
| BMW | F36 | 440i | B58 |
| BMW | F36 | 440i xDrive | B58 |
| BMW | G01 | X3 M40i | B58 |
| BMW | G02 | X4 M40i | B58 |
| BMW | G11 | 740i | B58 |
| BMW | G11 | 740i xDrive | B58 |
| BMW | G30 | 540i | B58 |
| BMW | G30 | 540i xDrive | B58 |
| BMW | G32 | 640i xDrive | B58 |
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 4
A little snug on the thighs
Size: Medium, Color: Multicoloured G (5-pack)
Super comfy, soft and thin. For reference, I'm 5'6", 135, athletic build. I bought medium. I almost returned them because I thought they were a bit too snug on my thighs, and my thighs are not large at all. I was concerned about panty lines under snug clothing. But, because they're thin, I figured they would probably stretch, so I kept them. So far, I've only worn them under a night shirt, but they're super comfortable and they dont ride up at all. Very nice, but if your thighs are a little thick, you probably won't like them.
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Reviewed in the United States on August 29, 2025
★★★★★ 5
Functional + Sexy
Size: Small, Color: Multicoloured E-(5-pack), Size: Small, Color: Multicoloured E-(5-pack)
Not only do these feel good, my husband can’t keep his hands off me. They fit so good and are soft. I change into these to sleep but also just use them as shorts to wear around the house. They’re comfortable and don’t slide around. I got a size small and I’m 100lbs.
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Reviewed in the United States on April 13, 2026
★★★★★ 5
Finally!
Size: X-Large, Color: All Black D (5-pack)
Finally, comfortable underwear that don’t end up giving me a wedgie. I have a round booty and most cuts of underwear end up shifting as I walk and sit. The hem of the underwear comes right under my cheeks and the lightweight material ensures there’s no panty line and no shifting to where I don’t want them! I’m definitely purchasing more.
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Reviewed in the United States on May 17, 2026
★★★★★ 3
Ehh
Size: Medium, Color: Multicoloured E-(5-pack)
Very thin, still comfy but very thin material. Super soft though. I've worn and washed and they have held up but I won't be repurchasing bc these are so thin
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Reviewed in the United States on April 14, 2026
★★★★★ 5
They’re fantastic!!!!
Size: X-Large, Color: Multicoloured E-(5-pack)
My clothing size is 16/18 and XL. Even though Amazon suggested a size XXL, I ordered my normal XL and they fit perfectly.
The fabric for this style is 92% bamboo viscose and is amazingly soft and almost silky feeling. I had ordered a different boy short in this brand but they were 80% bamboo viscose and the fabric was significantly heavier. I returned those and ordered these.
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Reviewed in the United States on April 25, 2026