MBRP Armor Pro S4501304 Resonator Bypass X-Pipe for 2021–2023 BMW M3 G80 and M4 G82 3.0L

THE ONLY EXHAUST YOU"LL EVER NEED - MBRP Armor Pro Series exhaust systems are backed by a Lifetime Warranty and crafted out of T304 Stainless Steel - the most durable material grade that money can buy. The T304 Stainless Steel tubing is easy to clean and maintain. It’s the obvious choice for you if you operate your vehicle in extreme conditions. All of the tubing is mandrel bent for maximum exhaust flow. Mandrel bending ensures no rippling in the bends. The end result is that it gives you more fresh air inside your engine’s cylinders, allowing it to produce more power and improve vehicle performance and longevity. MBRP, Stand out from the crowd with a performance exhaust system that sounds great. Armor Pro Resonator Bypass; 3 in.; Incl. Front Pipe Assembly/X-Pipe Assembly/Hardware; T304 Stainless Steel; X-Pipe Kit. Cutting Required for Installation.

• Durable T304 Stainless Steel Construction. Moderate Sound Level. Up to 17% Flow Increase. Laser Cut X-Pipe. Smooth Mandrel Bent Tubing.

Upgrade the exhaust flow and sound of your BMW with the MBRP Armor Pro S4501304 Resonator Bypass X-Pipe. Designed for the 2021–2023 BMW M3 G80 and BMW M4 G82 with the 3.0L engine, this performance exhaust component replaces the factory resonator section to provide a freer-flowing exhaust path and a more engaging driving experience. The kit includes the front pipe assembly, X-pipe assembly, and required installation hardware.

Built from durable T304 stainless steel, the MBRP Armor Pro X-pipe is engineered to withstand demanding road and operating conditions while remaining easy to clean and maintain. Smooth mandrel-bent tubing helps preserve consistent internal diameter through each bend, reducing restrictions and supporting improved exhaust flow. The laser-cut X-pipe design is engineered for efficient exhaust gas crossover and may provide flow gains of up to 17 percent, helping support engine performance and throttle response.

This MBRP resonator bypass system delivers a moderate sound level with a deeper, more performance-oriented exhaust character. Installation requires cutting, so professional installation or careful verification of the vehicle’s existing exhaust configuration is recommended. The MBRP Armor Pro Series is backed by a lifetime warranty for added long-term confidence. This product is not CARB approved and may not be legal for use on emissions-controlled vehicles in certain jurisdictions.

Product Specifications and Technical Data

• Brand: MBRP
• Part Number: S4501304
• Series: Armor Pro
• Component Type: Resonator bypass X-pipe kit
• Pipe Diameter: 3 inches
• Material: T304 stainless steel
• Sound Level: Moderate
• Installation: Cutting required; front pipe assembly, X-pipe assembly, and hardware included

What's Included

• Front pipe assembly
• Laser-cut X-pipe assembly
• Installation hardware

Fitment

Fits 2021–2023 BMW M3 G80 and BMW M4 G82 models equipped with the 3.0L engine.

Features:

• Durable T304 Stainless Steel Construction: Provides corrosion resistance, long-term durability, and easy maintenance in demanding driving conditions.
• Smooth Mandrel-Bent Tubing: Maintains consistent tube diameter through the bends to support efficient exhaust flow and reduced restriction.
• Laser-Cut X-Pipe Design: Promotes balanced exhaust gas crossover and contributes to improved system flow.
• Moderate Performance Sound: Delivers a deeper, more engaging exhaust note while maintaining a moderate overall sound level.

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
2024 BMW M3 Base
2024 BMW M3 Competition
2024 BMW M3 Competition xDrive
2024 BMW M3 CS
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
2025 BMW M4 CS
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
Regular Stock: t
Units Per Sku: 1