BMW G20/G21/G28 3 Series Catless Downpipe – Straight-Pipe Design for Maximum Flow, Horsepower Gains & Aggressive Exhaust Sound | Fits 3 Series Sedan, Touring & LWB Sedan with B48 2.0L Turbo Engine (2019–Present)

Unlock sharper throttle response, faster spool, and a raw, performance-driven tone with the BAVMODS® Catless Downpipe, precision-engineered for the BMW G20, G21, and G28 3 Series equipped with the B48 2.0L Turbo engine.

From the factory, the B48’s exhaust system is restricted by a dense catalytic converter that traps heat and builds backpressure — suffocating turbo efficiency. The BAVMODS® Catless Downpipe eliminates that bottleneck entirely, letting your turbo breathe freely, spool faster, and deliver the deep, aggressive sound your BMW deserves.

Engineered for Maximum Turbo Efficiency & Power

Built from high-grade T304 stainless steel and TIG-welded for lasting durability, this catless downpipe is designed for optimal flow and temperature control. Every bend is precision mandrel-formed to maintain smooth airflow and reduce turbulence — delivering noticeable improvements in turbo response and acceleration.

Key Performance Benefits:

• Free-Flow Design: Removes factory catalytic restriction for maximum exhaust velocity.
• Faster Turbo Spool: Boost pressure builds earlier and holds stronger through high RPMs.
• Dyno-Proven Gains: +20–35 HP and +25–45 lb-ft of torque when paired with a Stage 2 tune.
• Aggressive Exhaust Tone: Crisp, throaty exhaust note with signature turbo whistle.
• Reduced Heat Soak: Improves exhaust gas temperatures and overall thermal management.
• OEM+ Fitment: Direct bolt-on replacement using factory O₂ sensor locations and hardware.

Complete Plug-and-Play Installation Kit

Everything you need for a clean install is included — no cutting or modifications required.

Includes:

• Precision stainless-steel catless downpipe
• Pre-drilled O₂ sensor ports
• High-quality clamps, gaskets, and hardware

Pair with a Stage 2 ECU tune for full CEL (Check Engine Light) management and maximum gains.

Why Go Catless?

A catless downpipe is the most effective upgrade for unlocking your BMW’s true potential. By removing the restrictive catalytic converter, you’ll:

• Improve turbo response and airflow
• Reduce backpressure and heat buildup
• Enhance exhaust tone and character
• Unlock tuning potential for higher boost and power

It’s the must-have first step for anyone looking to push their B48-powered 3 Series to its full potential.

Performance You Can Hear and Feel

From the first cold start to the top of the powerband, the BAVMODS® Catless Downpipe transforms your 3 Series into a sharper, more responsive machine. Expect faster spool, more aggressive tone, and the kind of performance that makes every drive addictive.

Your B48 deserves freedom — not restriction.

FITMENT: BMW 3 Series (G20 Sedan / G21 Touring / G28 LWB Sedan) – 2019 to Present

ENGINE COMPATIBILITY: B48B20 / B48A20 – 2.0L TwinPower Turbo Inline-4

MATERIAL: High-Grade T304 Stainless Steel (TIG-Welded, Mandrel-Bent Straight-Pipe Design)

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