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For BMW 4 Series B58 Ternary Catalytic 200 Moly with Cat Downpipe

Original price was: $540.00.Current price is: $459.00.

Discount valid for 24 hours

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SKU: BMW 4 Series B58 Categories: , ,

Warranty service:3 years

Production cycle:10-15DAYS

Overview

High-Performance 200-Cell Catalytic Downpipe Upgrade

For BMW 4 Series B58 (3.0T)

Performance Downpipe | 200-Cell High-Flow Metallic Cat | Faster Turbo Spool & Horsepower Gains | Premium 304 Stainless Steel / Titanium Options

Unlock Maximum Turbo Efficiency, Exotic Sound & Peak Horsepower for Your B58-Powered BMW 4 Series.

Engineered specifically for BMW 4 Series models powered by the legendary B58 3.0L Turbocharged Inline-6 engine, this high-performance downpipe replaces the highly restrictive factory catalytic converter. By utilizing a high-flow 200-cell (200 Moly) metallic catalytic core, smooth mandrel bends, and optimized piping diameters, it significantly reduces exhaust backpressure, allowing the turbocharger to spool up faster while unleashing an aggressive, race-inspired exhaust note.

Crafted for Enthusiasts Who Demand Excellence Designed for drivers who want to unlock the true tuning potential of the B58 engine without switching to a completely catless setup. Built from premium high-grade stainless steel (or optional lightweight titanium alloy), this downpipe delivers exceptional heat tolerance, structural longevity, and maximum exhaust scavenging for daily driving or track performance.

DETAIL

🔥 Key Feature

Precision High-Flow Downpipe Upgrade

Replaces the restrictive factory catalytic converter section to optimize overall exhaust gas velocity directly off the turbocharger.

200-Cell High-Flow Metallic Catalyst

Features a high-performance 200-cell catalytic core that maximizes exhaust flow and power gains while reducing exhaust odors compared to fully catless systems.

Maximized B58 Turbo Efficiency

Drastically decreases backpressure and exhaust gas temperatures (EGT), resulting in noticeably quicker turbo spool, sharper throttle response, and increased horsepower and torque across the entire rev range.

Aggressive Inline-6 Sound Profile

Amplifies the iconic BMW inline-6 exhaust rumble, bringing out distinct turbo spool sounds and pops under hard acceleration while keeping daily cruising refined.

Precision TIG Welded Construction

Expertly TIG-welded to guarantee superior structural integrity, leak-free seals, and a smooth inner wall surface for uninterrupted exhaust flow.

Direct Bolt-On Fitment

Engineered precisely to match OEM mounting brackets, flanges, and $O_2$ sensor ports for a straightforward, direct-replacement installation.

spec
Fitment: BMW 4 Series
Engine:B58 3.0L Turbocharged Inline-6
System Type:Catalytic Downpipe (200-Cell High-Flow Cat)
Welding:Precision TIG Welded
Material:SUS304 Stainless Steel
Installation: Direct Bolt-On
Warranty: 3 Years
COMPANY VIDEO

We are a 15-year-old factory specializing in manufacturing high-quality automobile exhaust systems and accessories. Our product range includes exhaust manifolds, downpipes, cat-back exhausts, mufflers, electronic valves, exhaust tips, and other auto parts.

Why Choose Our Exhaust Systems?

☆ Perfect Fit: Manufactured according to the original car’s mounting holes, ensuring 100% installation compatibility.
☆ Experience & Expertise: With over 13 years in exhaust production and sales, we have molds for the most popular models, widely praised by our customers.
☆ Advanced Mufflers: Our factory-developed mufflers provide a silencing effect close to the original exhaust, delivering a comfortable driving experience.
☆ Electronic Valve Control: Equipped with our latest electronically controlled valves, allowing you to adjust the exhaust sound freely.
☆ Reliable Production & Delivery: Independently produced in our factory, with 100% order fulfillment and guaranteed delivery times.
☆ Customized Services: We offer tailored exhaust solutions for various car models according to your needs.

Our Expertise

For 15 years, we have specialized in manufacturing, producing, and selling automobile exhaust systems, with thousands of original exhaust models in our database. Our coverage includes brands such as:

Porsche | BMW | Mercedes-Benz | Audi | McLaren | Ferrari | Mitsubishi | Lamborghini | Bentley | Subaru | Aston Martin | Toyota | Volkswagen | Cadillac | Camaro | Dodge | Jaguar | Nissan | Alfa Romeo | Maserati

If you have a specific model and custom requirements, click here to inquire and contact us. We will provide professional solutions tailored to your vehicle.

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faq

  • What vehicles is this catback exhaust system compatible with?

    This catback exhaust system is specifically designed for BMW M340i (G20 chassis, 2019+) and BMW M440i (G22 chassis, 2021+) models equipped with the 3.0T B58 engine. It is not compatible with non-M340i/M440i 3 Series (G20) or 4 Series (G22) variants, or models with different engine configurations.

  • What does “catback” mean, and how is it different from other exhaust systems?

    This catback exhaust system is specifically designed for BMW M340i (G20 chassis, 2019+) and BMW M440i (G22 chassis, 2021+) models equipped with the 3.0T B58 engine. It is not compatible with non-M340i/M440i 3 Series (G20) or 4 Series (G22) variants, or models with different engine configurations.

  • What performance benefits will I gain from installing this catback exhaust?

    This catback exhaust system is specifically designed for BMW M340i (G20 chassis, 2019+) and BMW M440i (G22 chassis, 2021+) models equipped with the 3.0T B58 engine. It is not compatible with non-M340i/M440i 3 Series (G20) or 4 Series (G22) variants, or models with different engine configurations.

  • Is this exhaust system street-legal? Does it comply with emissions laws?

    This catback exhaust system is specifically designed for BMW M340i (G20 chassis, 2019+) and BMW M440i (G22 chassis, 2021+) models equipped with the 3.0T B58 engine. It is not compatible with non-M340i/M440i 3 Series (G20) or 4 Series (G22) variants, or models with different engine configurations.

  • Can I install this exhaust myself, or do I need a professional?

    This catback exhaust system is specifically designed for BMW M340i (G20 chassis, 2019+) and BMW M440i (G22 chassis, 2021+) models equipped with the 3.0T B58 engine. It is not compatible with non-M340i/M440i 3 Series (G20) or 4 Series (G22) variants, or models with different engine configurations.

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