BMW 3 Series (F30/F31/F34/F35) Catless Downpipe – High-Flow Stainless Steel Design for Enhanced Turbo Response & Performance | Fits 318i, 320i & 330i Sedan, Touring, GT & Long Wheelbase Models – B46 2.0L Turbo Engine (2016–2019)

Unlock the performance potential of your BMW 3 Series (F30/F31/F34/F35) with the BAVMODS® Catless Downpipe — engineered for the B46 2.0L TwinPower Turbo engine to increase exhaust flow, improve turbo spool, and produce a deeper, more refined tone.

The factory catalytic converter on BMW’s B46 engine is highly restrictive, trapping heat and limiting flow — resulting in slower spool times and reduced efficiency. The BAVMODS® Catless Downpipe eliminates this restriction entirely, freeing up the exhaust path to let your turbo breathe and perform as it was truly designed to.

Precision-Built for the B46 Engine

Constructed from premium T304 stainless steel, each downpipe is TIG-welded by hand and mandrel-bent for a smooth, unrestricted flow path. It includes pre-welded O₂ sensor ports, factory-positioned mounting flanges, and an integrated heat shield section to maintain safe operating temperatures under load.

Key Performance Benefits

• Free-Flow Straight-Pipe Design: Removes the restrictive factory cat to maximize exhaust velocity.
• Improved Throttle Response: Reduces backpressure for faster boost buildup and stronger midrange torque.
• Dyno-Proven Gains: Expect measurable horsepower and torque increases with a proper Stage 2 ECU tune.
• Aggressive Exhaust Note: Deep, crisp turbo tone with refined pops and burbles under throttle.
• Thermal Efficiency: Built-in heat shielding keeps engine bay temperatures low and consistent.
• OEM+ Fitment: Direct bolt-on compatibility with factory or aftermarket exhaust systems.
• Installation & Compatibility

Includes all necessary clamps, gaskets, and mounting hardware for a true bolt-on installation — no cutting or welding required. For maximum results and to clear CEL codes, a Stage 2 tune is recommended.

Performance You Can Feel

Experience sharper throttle response, quicker spool, and a performance tone that transforms the driving experience of your 3 Series. Built to perform and last, the BAVMODS® Catless Downpipe is the ultimate upgrade for your daily or tuned build.

FITMENT: BMW 3 Series (F30 Sedan / F31 Touring / F34 GT / F35 LWB Sedan) – 318i, 320i, 330i (2016–2019)

ENGINE COMPATIBILITY: B46 2.0L TwinPower Turbo Inline-Four

NOTE: For off-road or competition use only. Always verify your vehicle’s engine code and year before installation for proper compatibility.

Please refer to the “Fitment” section in the product description for compatibility details.