B58 4.5" Catless Downpipe for 2016 – 2023 BMW M240i/340i/440i/540i/740i/840i
Pipe size 4.5 inch
Catalyst Catless
Application B58 BMW / Supra
Build data

Specs that matter for this part

Hardware

Flow-focused exhaust path

Large-diameter tubing, smooth bends, and a flex section reduce restriction versus the factory exhaust path.

Validation

Catalyst configuration

Catless setup. Review local emissions requirements and product notes before street use.

Requirement

Direct bolt-on hardware

Designed to retain OEM-style fitment without cutting or welding on supported applications.

Downpipes can affect emissions readiness, sound level, and calibration needs. Review the product description before ordering.

Unleash the full potential of your BMW B58 engine or Toyota Supra B58 with the 4.5” Catless Downpipe, designed for maximum airflow, increased power, and an aggressive exhaust tone. By eliminating the restrictive stock catalytic converters, this upgrade reduces backpressure, enhances turbo spool, and improves throttle response, making it an essential modification for enthusiasts seeking optimal performance gains.

Note:

THIS DOES NOT FIT GEN 3 B58. HERE IS THE LINK TO OUR GEN 3 B58 DOWNPIPE.

Engineered for Maximum Power & Sound

With a free-flowing 4.5-inch design, this downpipe optimizes exhaust flow, allowing your turbo to spool faster, which translates to higher power output and a more responsive driving experience. Expect up to 30HP gains on a tuned stock turbo and even greater performance on upgraded turbo setups.

Key Features & Benefits

  • In Stock & Ready to Ship – No long wait times
  • Up to 30HP Gains – Significant horsepower and torque improvements, with even more power on upgraded turbos
  • Faster Turbo Spool – Enhanced throttle response and reduced turbo lag
  • Optimized Airflow Design – Smooth bends ensure unrestricted exhaust flow while minimizing drone
  • Aggressive Exhaust Note – Delivers a deep, bold exhaust tone that amplifies the B58’s signature sound
  • Perfect Fitment – Designed for direct bolt-on installation, compatible with both right-hand drive (RHD) and left-hand drive (LHD) vehicles
  • Durable Construction – Built to handle high-performance demands while maintaining precision fitment
  • Made with SS304 Stainless Steel

Vehicle Fitment

This 4.5” Catless Downpipe is designed to fit BMW and Toyota B58-powered models, including:

Generation 1 (Gen 1) B58 Models (2016-2019):
  • 2016-2019 BMW 340i (F30/F31/F32)
  • 2017-2019 BMW 240i (F22/F23)
  • 2017-2019 BMW 440i (F32/F33/F36)
  • Other BMW models equipped with the Gen 1 B58 engine
Generation 2 (Gen 2) B58 Models (2020+):
  • 2020-2024 Toyota GR Supra (A90/A91)
  • 2020-2024 BMW M340i (G20/G21)
  • 2022-2024 BMW M240i (G42)
  • Other BMW models with the Gen 2 B58 engine

Shipping & Inspection Policy

  • Secure Packaging – Each downpipe is carefully packaged to prevent shipping damage
  • Inspection Required – Inspect before signing for delivery; report any damage within 24 hours
  • Do Not Refuse Shipment – Contact CenCal Motorsport first for claims assistance

Shipping Information

  • Domestic Shipping – Ships from the Continental U.S.
  • International Shipping – Contact for a quote
  • Fast Shipping – In stock and ready to ship

Upgrade your BMW B58 or Toyota Supra A90/A91 with the 4.5” Catless Downpipe, engineered for maximum horsepower, faster turbo response, and an aggressive exhaust note.

⚠️ THIS PRODUCT IS FOR OFFROAD USE ONLY

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