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:

• 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:

• +15–25 HP (stock tune)

• +40+ HP (with tune)

• Noticeable reduction in turbo lag

• Enhanced exhaust sound and turbo spool

Vehicle Compatibility:

• 2018–2023 BMW M340i (G20) – B58 3.0L Turbo I6

• 2019–2023 BMW Z4 M40i (G29) – B58 3.0L Turbo I6

• 2020–2023 Toyota GR Supra 3.0 (A90/A91) – B58 3.0L Turbo I6

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.

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.