B58 Exhaust 4.5in DownPipe w/ Heatshied - BMW M340i B58 G20 G29 Supra A90 B58 2018-2023
Unlock the full potential of your B58 engine with our High-Performance Exhaust Downpipe with Integrated Heat Shield, engineered to deliver massive gains in power, sound, and turbo efficiency. Designed as a direct bolt-on upgrade for B58-equipped vehicles, this downpipe significantly reduces backpressure, allowing your turbocharger to spool faster and breathe freely.
Precision-built for enthusiasts who demand performance without compromise, this downpipe features a high-flow design and a custom-fitted heat shield to protect surrounding components from radiant heat.
Key Features:
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High-Flow Design
Increases exhaust gas flow by reducing restrictions, resulting in improved turbo spool, throttle response, and horsepower gains. -
304 Stainless Steel Construction
Built from premium T304 stainless steel for long-term durability and corrosion resistance under high temperatures and harsh conditions. -
Integrated Heat Shield
Professionally fabricated heat shield protects engine bay components and reduces heat soak, ideal for daily drivers and track builds alike. -
CNC Machined Flanges
Ensures a perfect, leak-free fit with factory or aftermarket turbochargers and midpipes. -
Mandrel-Bent Tubing
Smooth, precision bends eliminate flow disruptions and turbulence for optimal performance. -
Factory Fitment & Easy Installation
Direct bolt-on replacement with no cutting or welding required. Retains use of OEM mounting points and O2 sensor locations. -
Optional 200 Cell High-Flow Catalytic Converter or Catless Configuration
Choose between catted (emissions-friendly) or catless (track use) options based on your performance goals. -
TIG-Welded for Strength & Aesthetics
Clean, strong welds ensure durability while giving a race-ready appearance.
Performance Gains:
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+15–25 HP (stock tune)
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+40+ HP (with tune)
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Noticeable reduction in turbo lag
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Enhanced exhaust sound and turbo spool
Vehicle Compatibility:
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2018–2023 BMW M340i (G20) – B58 3.0L Turbo I6
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2019–2023 BMW Z4 M40i (G29) – B58 3.0L Turbo I6
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2020–2023 Toyota GR Supra 3.0 (A90/A91) – B58 3.0L Turbo I6
Regular Cleaning: Maintain carbon fiber parts by cleaning them regularly with a soft cloth and a mixture of mild soap and water. Avoid abrasive or harsh cleaners that could harm the finish.
Use Microfiber Pads and Cloths: Opt for microfiber pads and cloths when cleaning or applying protective coatings to prevent surface scratches.
Protect from Sun and Chemicals: Limit exposure to direct sunlight and harsh chemicals, as they can damage carbon fiber. When possible, use protective covers or park your vehicle in shaded areas.
We want you to have our parts as quickly as possible. Products that are in stock will be shipped and delivered domestically in 1–5 business days. It will take seven to twenty-one business days for international shipment. An email confirming that your order is being completed will be sent to you once you place it. For in-house orders, please allow a day for processing and the updating of the tracking number. The product page accurately shows the quantity.
Custom steering wheels typically take 20-25 business days for production, with an additional 5-7 business days for shipping. Production and delivery times may vary depending on the complexity of the order and the shipping destination. For more details, please refer to our Shipping Policy.
Our Return Policy permits returns only for products that are found to be defective. You have 30 days from the date of delivery to inspect the product and report any issues.
Why Thousands of
Enthusiasts Trust Us
The Carbon Industries delivers premium, precision-engineered parts that elevate Mercedes performance and style—backed by expert support and a true passion for the culture.
Vehicle-Specific Fitment
Each part is designed for a specific make, model and generation. Enter your vehicle to confirm it fits before you buy.- Premium Materials, Always
We use only high-quality carbon fiber construction known for lightweight strength and durability. - UV Protection
Finished with a UV-resistant clear coat that protects against fading and discoloration.
Your hands will know the difference
A custom carbon fiber steering wheel isn't just a look, it's the first thing you touch every time you drive. The weave, the weight, the grip, all built around your car and your style, so the cockpit feels as dialed-in as the rest of the build.
Shop now
The material every serious builder need
Carbon fiber isn't a trend, it's what separates a serious build from a show car. Strength without the weight, precision without the guesswork. On modern performance cars, it's stopped being an upgrade and started being the standard. We just make sure yours fits like it was born there.
Shop nowBuilt for the ones who notice gaps
You've seen our work. You just didn't know it.
We've seen the horror stories — panel gaps, mismatched clearcoat, parts that "should" fit. Not here. Every piece is checked against the car it's going on, not just the spec sheet. That's why the same names keep coming back.
GOT QUESTIONS?
FREQUENTLY ASKED QUESTIONS
Will these parts fit my specific Vehicle model and year?
If you’re unsure, just send us your VIN or model/year, and our team will confirm fitment for you within 24 hours. We specialize in BMW and European vehicles, so you’re in good hands.
Are these genuine carbon fiber or carbon fiber overlay parts?
We offer only full carbon fiber options. Each listing clearly specifies the construction material. Rest assured, we only source high-quality parts that are durability-tested and made to OEM or better standards.
How long does shipping take and where do you ship from?
Most orders ship from our Irvine, CA warehouse within 1–3 business days. Domestic delivery typically takes 3–7 business days. International shipping times vary by country. Each product page includes real-time shipping estimates based on your location. Certain made to order products will take up to 3-4 weeksfor delivery, including production time.
Do I need professional installation or can I install it myself?
Many of our mods are designed for direct bolt-on installation and can be installed at home with basic tools. However, for certain parts like aero kits or performance components, we recommend professional installation for best results. Each product page includes install difficulty and notes. We offer professional installation at our Santa Clara, CA location.
What if the product doesn’t fit or I change my mind?
No worries — we offer hassle-free returns within 30 days of delivery. If the part doesn’t fit due to an error on our end, we’ll cover the return shipping. For all other returns, we make it easy to exchange or get a refund. See our full Returns & Warranty Policy for details.
Are your parts tested for quality and durability?
Absolutely. All of our products go through quality control checks and are either TUV-certified, ISO-certified, or tested by our in-house team and verified installers. We don’t sell anything we wouldn’t put on our own cars.
Do you offer warranties on your parts?
Yes. Most of our products come with a 90-day limited warranty against manufacturing defects. Some premium items offer extended warranties — details are listed on the product pages. We’re committed to quality and stand behind what we sell.
Can I finance or pay in installments?
Yes — we offer Shop Pay, Affirm, AfterPay, and Klarna at checkout. You can split your purchase into 4 interest-free payments or choose longer-term plans if needed. It’s quick, easy, and won’t affect your credit score (in most cases)
