The Labyrinth B58 5 Inch Downpipe is built for maximum exhaust flow, designed as the single least restrictive downpipe for the platform, it is the perfect supporting upgrade when paired with the Labyrinth B58 HPFP Kit.

Product description

The Labyrinth B58 5 Inch Downpipe is engineered for B58 owners who want serious flow capacity without sacrificing fitment, quality, or drivability. The large 5 inch design helps minimize exhaust restriction after the turbo, allowing the B58 to breathe more efficiently under higher boost and heavier load.

Compared to the factory downpipe, this setup is designed to reduce backpressure, support faster turbo response, and unlock a sharper, more aggressive exhaust note. Whether you are building a tuned street car, running ethanol blends, pushing higher boost, or preparing for an upgraded turbo setup, the Labyrinth 5 Inch Downpipe gives your exhaust system the flow capacity needed to support the next level of performance.

For the best complete setup, pair this downpipe with the Labyrinth B58 Gen 1 HPFP Kit. Together, they support two of the most important areas on a tuned B58 build: fuel supply and exhaust flow. The HPFP kit helps feed the engine, while the 5 inch downpipe helps the turbo move exhaust out with less restriction. 

Every Labyrinth downpipe is designed with fitment, durability, and performance in mind, giving your build a clean, purpose built upgrade that looks as good as it performs.

Key features

5 inch high flow construction
Designed as one of the least restrictive B58 downpipe options available
Helps reduce post turbo exhaust restriction
Supports improved turbo response and faster spool
Deeper, sharper, more aggressive exhaust tone
Excellent supporting upgrade for tuned B58 applications
Ideal for ethanol blends, higher boost, and upgraded turbo setups
Pairs perfectly with the Labyrinth B58 Gen 1 HPFP Kit
Built for clean fitment on compatible B58 models
Designed for performance focused street and track builds

Fitment

Designed for B58 powered BMW models, including:

BMW M140i
BMW M240i
BMW 340i
BMW 440i
BMW 540i

Fitment may vary by chassis, model year, drivetrain, and market. Please verify compatibility before ordering.

Notes

Professional installation and proper tuning are recommended for best results. This product may not be legal for street use in all areas. Buyer is responsible for confirming local emissions laws before purchase or installation.