Dinan 21-27 BMW M3/M4 G80/G82/G83 High Flow Middle Exhaust with 3-Inch Stainless Steel Tubing

This middle exhaust itself removes the hydro-formed factory center section from the secondary catalysts back to the axle back, including both resonators, and replaces it with larger 3-inch T304 stainless steel tubing for freer flowing capabilities. In place of the forward factory resonator, Dinan incorporates a beautifully crafted X-pipe made from mandrel-bent tubing for minimum restriction, unlike stamped X-pipes which are commonplace in the market. This hand-made 'X' is not only the focal point of the system in terms of aesthetics but also the star when it comes to the effects on the sound. Promoting even flow to both banks of tips, the 'X' removes unwanted nuances in sound caused by uneven exhaust flow that is present in the stock system. Along with the inherent benefit of increased volume by removal of the resonators, the Dinan X-Pipe for the G8x M3/M4 produces a louder, smoother, and fuller exhaust note that will deliver smiles time and time again. Stainless Steel - 3" - G80/G82/G83 Only confirmed to fit with the Dinan Free Flow Axle Back and stock exhaust systems (including M Performance). Fitment with other axle back units is not guaranteed.

• Deletes resonators between the secondary catalysts and rear muffler for increased volume
• 5-pounds lighter than the stock mid-section (Stock: 22-pounds vs. Dinan: 17-pounds)
• Includes X-pipe crossover made from mandrel bent tubing for minimum restriction
• 76mm (3-inch) tubing replaces stock 70mm (2.75-inch) tubing for free flow
• Factory-like fitment with included mounting hardware
• 100% 304 stainless steel construction
• Smoother, louder and sportier sound

The Dinan High Flow Middle Exhaust System for 2021-2023 BMW M3 and M4 models is engineered to optimize exhaust flow and enhance sound performance. Crafted from 100% 304 stainless steel, this system replaces the factory center section from the secondary catalysts back to the axle back, including both resonators, with larger 3-inch mandrel-bent tubing for increased airflow and reduced restriction. The system is designed specifically to improve exhaust volume and tone, delivering a more aggressive and sportier sound profile without sacrificing reliability or durability.
The centerpiece of this upgrade is the mandrel-bent X-pipe, which is meticulously handcrafted for minimal restriction and a smooth, even flow between the two banks of the exhaust. Unlike common stamped X-pipes, this hand-made component not only enhances the aesthetic appeal but also significantly improves exhaust note consistency by eliminating unwanted sound nuances caused by uneven flow. The removal of resonators further amplifies the volume, resulting in a louder, fuller exhaust note that enhances driving excitement.
Installation is straightforward with factory-like fitment, including all necessary mounting hardware. The system is approximately 5 pounds lighter than the stock mid-section, contributing to a slight reduction in overall vehicle weight. Designed to pair seamlessly with Dinan’s Free Flow Axle Back and stock exhaust systems, this system is not guaranteed compatible with other aftermarket axle back units. The upgraded tubing size from 70mm (2.75 inches) to 76mm (3 inches) ensures maximum free flow, supporting a louder, smoother, and more aggressive sound that elevates the driving experience for BMW enthusiasts seeking performance and sound enhancements.

Features:

• Deletes resonators between secondary catalysts and rear muffler for increased volume

• Lighter weight: approximately 5 pounds less than the stock mid-section

• Includes handcrafted X-pipe crossover made from mandrel-bent tubing for minimal restriction

• Upgrades from 2.75-inch to 3-inch tubing for enhanced airflow

• Factory-like fitment with included mounting hardware ensures easy installation

• Constructed entirely from durable 304 stainless steel for corrosion resistance

• Produces a louder, smoother, and sportier exhaust note for a more aggressive driving experience

Fitments:
2021 BMW M3 Base
2021 BMW M3 Competition
2021 BMW M4 Base
2021 BMW M4 Competition
2022 BMW M3 Base
2022 BMW M3 Competition
2022 BMW M3 Competition xDrive
2022 BMW M4 Base
2022 BMW M4 Competition
2022 BMW M4 Competition xDrive
2023 BMW M3 Base
2023 BMW M3 Competition
2023 BMW M3 Competition xDrive
2023 BMW M4 Base
2023 BMW M4 Competition
2023 BMW M4 Competition xDrive
2023 BMW M4 CSL
2024 BMW M3 Base
2024 BMW M3 Competition
2024 BMW M3 Competition xDrive
2024 BMW M4 Base
2024 BMW M4 Competition
2024 BMW M4 Competition xDrive
2025 BMW M3 Base
2025 BMW M3 Competition
2025 BMW M3 Competition xDrive
2025 BMW M4 Base
2025 BMW M4 Competition
2025 BMW M4 Competition xDrive
2026 BMW M3 Base
2026 BMW M3 Competition
2026 BMW M3 Competition xDrive
2026 BMW M4 Base
2026 BMW M4 Competition
2026 BMW M4 Competition xDrive

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Units Per Sku: 1
Regular Stock: t