Product Overview

Upgrade your BMW M340i / M440i (G20 / G21 / G22, B58 3.0T, 2020+) with this high-performance catless downpipe exhaust system designed to significantly improve turbo efficiency, exhaust flow, and overall engine response. Engineered for performance-focused driving, this upgrade reduces factory exhaust restriction and helps unlock additional horsepower and torque potential.

Constructed from premium SUS 304 stainless steel, the system delivers excellent heat resistance, corrosion protection, and long-term durability. Its front-mounted design ensures optimal exhaust gas evacuation directly from the turbocharger, making it one of the most effective performance upgrades for the B58 platform.

Key Features

High-Flow Catless Downpipe Design

Eliminates factory catalytic restriction to improve exhaust flow and turbo performance.

Vehicle-Specific Fitment

Designed specifically for BMW M340i and M440i G20 / G21 / G22 models equipped with the B58 3.0T engine (2020+).

SUS 304 Stainless Steel Construction

High-grade stainless steel ensures excellent durability, heat resistance, and corrosion resistance.

Front Turbo Outlet Position

Installed at the front section to maximize exhaust evacuation efficiency and reduce backpressure.

Micropole Muffler Structure

Helps maintain smooth exhaust gas flow while improving engine response and performance characteristics.

Chemical-Free Manufacturing

Produced without high-concern chemicals, ensuring safer materials and environmentally conscious production.

Specifications

Product Type: Performance Catless Downpipe

Vehicle Compatibility: BMW M340i / M440i

Chassis: G20 / G21 / G22

Engine Compatibility: B58 3.0T (2020+)

Material: SUS 304 Stainless Steel

Muffler Type: Micropole Muffler Structure

Mounting Position: Front (Turbo Downpipe Section)

Installation Type: Performance Exhaust Upgrade

Manufacturing Origin: Mainland China

Condition: Performance Modified Part

Performance Benefits

Increased Horsepower Potential

Catless design reduces exhaust restriction, supporting higher engine output.

Improved Turbo Response

Enhanced exhaust flow allows faster turbo spool and sharper throttle response.

Optimized Exhaust Gas Flow

Front-mounted design improves evacuation efficiency directly from the turbo system.

More Aggressive Exhaust Sound

Delivers a deeper, louder, and more performance-oriented exhaust tone.

Enhanced Driving Dynamics

Improves acceleration feel and overall driving responsiveness.

High Thermal Durability

304 stainless steel construction withstands extreme exhaust temperatures and long-term use.

Ordering & Production

Production Time: 7–10 business days after order confirmation.

Wholesale Availability: Available for retail and bulk orders.

Required Vehicle Information:

• Vehicle model (M340i or M440i)
• Chassis (G20 / G21 / G22)
• Engine type (B58 3.0T)
• Model year
• Any existing exhaust or turbo modifications

Fitment Verification: All vehicle details will be reviewed prior to production to ensure compatibility and installation accuracy.

⚠️ Important Notes

Performance Modification Notice: This is a high-performance exhaust modification part intended for off-road or motorsport use in regions where applicable regulations apply.

Sound & Emissions Notice: Exhaust sound levels and emissions behavior may vary depending on vehicle setup and tuning configuration.

Professional Installation Recommended: Installation should be carried out by experienced professionals to ensure correct fitment and safe turbo system operation.

International Shipping Notice: Minor cosmetic marks or slight deformation caused during shipping do not affect performance or functionality.

Order Confirmation: Please verify all specifications before production begins. Customized performance parts cannot be modified or canceled after manufacturing starts.