BMW G22/G23/G26 4 Series Catless Downpipes – Straight-Pipe Design for Maximum Flow, Horsepower Gains & Aggressive Exhaust Sound | Fits G22 Coupe, G23 Convertible & G26 Gran Coupe with B58 Gen 2 3.0L Turbo Engine (2020–Present)

Transform the way your B58-powered 4 Series performs with the BAVMODS® Catless Downpipes — precision-engineered to deliver faster spool, sharper throttle response, and a deep, motorsport-inspired tone that brings your G22/G23/G26 to life.

The factory catalytic converter on BMW’s B58 Gen 2 engine is extremely dense, trapping heat and creating unwanted backpressure that robs horsepower and slows turbo response.

This BAVMODS® Catless Downpipe removes this restriction entirely — letting your turbo breathe freely and perform the way it was truly designed to.

Engineered for the B58 Gen 2 Powerhouse

Built from high-grade T304 stainless steel, each downpipe is TIG-welded by hand with precision-formed mandrel bends to ensure the smoothest internal flow path possible. Every unit includes pre-welded mounting brackets, factory-positioned O₂ bungs, and an integrated heat-sleeve section to protect surrounding components from radiant heat.

Key Performance Benefits

• Free-Flow Straight-Pipe Design – Eliminates the restrictive factory cat to maximize exhaust velocity.
• Sharper Throttle Response – Reduces backpressure, allowing boost to build faster and sustain longer.
• Dyno-Proven Gains – Expect +20 – 35 HP and +25 – 45 lb-ft of torque with a proper Stage 2 tune.
• Aggressive Exhaust Tone – Deep, crisp tone at idle with turbo whistle and sharp pops under load.
• Thermal Efficiency – Integrated heat sleeve lowers EGTs and protects nearby components.
• OEM+ Fitment – Direct bolt-on design with pre-welded brackets for a seamless installation.

Complete Plug-and-Play Installation Kit

Everything you need for a precise install — no cutting, welding, or modification required.

Includes:

• Stainless-steel catless downpipe assembly
• Pre-welded O₂ sensor ports
• Mounting brackets and reinforced heat shielding
• Premium clamps, gaskets, and hardware

Pair with a Stage 2 ECU tune for full CEL management and maximum performance potential.

Why Go Catless?

Going catless is the most effective way to unleash your turbo BMW’s potential. By removing the stock catalytic restriction, you:

• Unlock quicker turbo spool and improved boost consistency
• Reduce exhaust backpressure for higher top-end power
• Lower under-hood temperatures for long-term reliability
• Gain a more pronounced exhaust character and turbo whistle

This is the single most impactful performance upgrade for any B58 Gen 2-powered G-chassis 4 Series.

Performance You Can Hear & Feel

From cold start to redline, the BAVMODS® Catless Downpipe delivers sharper response, quicker acceleration, and a refined yet aggressive tone that transforms your everyday drive into a true enthusiast experience.

Your B58 deserves freedom — not restriction.

FITMENT: BMW 4 Series (G22 Coupe / G23 Convertible / G26 Gran Coupe) – 2020 to Present

ENGINE COMPATIBILITY: B58B30O2 – 3.0L TwinPower Turbo Inline-6 (Gen 2)

MATERIAL: High-Grade T304 Stainless Steel (TIG-Welded, Mandrel-Bent, Pre-Welded Brackets & Heat Shield Sleeve)

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