B58 4.5” and 5" Race Downpipe

The factory downpipe on the B58 platform is designed for emissions compliance and creates significant restriction in the exhaust system. These race downpipes are designed to eliminate that restriction, allowing exhaust gases to flow more freely, improving turbo response, increasing power, and delivering a more aggressive exhaust tone. Available in both 4.5-inch and 5-inch configurations, you can choose the setup that best fits your performance goals and sound preference. With a fully catless design, the turbo is able to spool faster and operate more efficiently, resulting in noticeable gains in performance and throttle response. Key Features Direct OEM fitment Available in 4.5-inch or 5-inch high-flow race design Catless design for maximum exhaust flow Significant reduction in exhaust restriction Improved turbo response and power output Increased exhaust volume and aggressive tone Precision CNC-machined flanges Mandrel-bent 304 stainless steel construction TIG-welded for strength and durability Compatible with factory and aftermarket exhaust systems   Build Quality Manufactured from 304 stainless steel with smooth transitions and precision welds to ensure optimal exhaust flow and long-term durability under high heat and boost conditions. Fitment Fits: BMW M240i (2017–2025) BMW M340i (2019–2024) BMW M440i (2021–2024) BMW 340i (2016–2018) BMW 440i (2017–2020) BMW 540i (2017–2020) BMW 740i (2016–2020) BMW 840i (2020+) B58 Gen 1 and Gen 2 engines   Important Notes For off-road use only Catless design will trigger a check engine light without proper tuning ECU tune required for optimal performance Increased exhaust sound and odor compared to factory catalytic systems Professional installation recommended Please include your VIN in the order notes so we can confirm fitment and supply the correct product If installation is selected, this order will be shipped to our Burbank installation location for scheduled service   Shipping Estimated delivery: 4–8 business days Tracking provided once shipped Warranty 36-month warranty covering manufacturer defects only Covers defects in materials or workmanship under normal use   Exclusions Does not cover improper installation Does not cover misuse, abuse, or neglect Does not cover normal wear and tear Does not cover damage caused by failing or reused components such as gaskets, clamps, or related hardware Installation by BimmerTechsLA If installed by BimmerTechsLA, labor is covered under warranty for 36 months Labor coverage applies only to issues directly caused by a defect in the product Labor warranty does not cover issues caused by unrelated parts, pre-existing conditions, or customer-requested reuse of worn components   Installation & Delivery Installation available at BimmerTechsLA (Burbank, CA) upon request If installation is selected or a free-shipping/install code is used, your order will be shipped directly to our installation location By selecting installation or using the install code, you agree to have your product delivered to BimmerTechsLA for scheduled installation Orders without installation selected will be shipped to the customer’s provided address