B58 4.5" Catless Downpipes - M240i/M340i/M440i/540i/740i

4.5" Catless Downpipes – B58 Engine | BMW 340i / M240i / M340i / M440i / 540i / 740i (2016+)

Unleash the full potential of your B58-powered BMW with our 4.5-Inch Catless Downpipes, engineered for maximum power and an aggressive exhaust tone. Designed to eliminate factory restrictions, these downpipes improve turbo response, reduce backpressure, and dramatically enhance your driving experience—on the street or track.

Key Features:

• 🔥 Oversized 4.5-Inch Diameter
  One of the largest B58 downpipes available, designed to support high-boost applications and serious power builds.

• ⚡ Catless Design for Maximum Flow
  Deletes restrictive factory catalytic converters to unlock horsepower and torque while improving turbo efficiency.

• 🏁 Deeper Exhaust Note & Sharper Spool
  Expect louder turbo sounds, crisper throttle response, and aggressive overrun crackles.

• ⚙️ OEM-Style Direct Fitment
  Bolts directly to stock turbo and mates with factory or aftermarket exhaust systems. No cutting or modification needed.

• 🛠️ T304 Stainless Steel Construction
  Crafted with precision TIG welds, CNC flanges, and mandrel bends to withstand extreme temps and ensure long-lasting performance.

• 🔧 ECU Tune Required
  A Stage 2 tune is strongly recommended to avoid CEL (Check Engine Light) and extract full performance.

Vehicle Compatibility:

• BMW 340i (F30/F31) – 2016–2019

• BMW M240i (F22/G42) – 2017+ / 2022+

• BMW M340i (G20/G21) – 2019+

• BMW M440i (G22/G23/G26) – 2021+

• BMW 540i (G30) – 2019+

• BMW 740i (G11/G12 LCI) – 2019+

• Compatible with B58 Gen 1 & Gen 2 engines
  (Please confirm model year & emissions spec for best fitment)

Note: For off-road and racing use only. Not CARB compliant. Check local emissions laws before installation.