BMW 740i 2008-2015 Exhaust Specifications

• Primary exhaust components made of stainless steel for durability and corrosion resistance.
• Exhaust pipes feature a double-wall construction for heat insulation.
• Muffler and catalytic converter housings are constructed from high-grade steel alloys.
• Exhaust tips are chrome-plated for aesthetic appeal and corrosion resistance.

• Exhaust system features a dual-pipe design for improved airflow and performance.
• Catalytic converters are positioned close to the engine for optimal emissions control.
• Muffler is centrally located to reduce noise and improve exhaust flow.
• Exhaust tips are integrated into the rear bumper for a seamless design.

Note: The dual-pipe design enhances exhaust gas flow, reducing backpressure and improving engine efficiency.

• Two catalytic converters are installed, one per exhaust bank.
• Each converter has a diameter of 120 mm and a length of 300 mm.
• Designed to meet Euro 5 emissions standards.
• Operating temperature range: 400°C to 800°C.

• Muffler dimensions: 600 mm (length) x 300 mm (width) x 200 mm (height).
• Internal baffle design reduces exhaust noise by up to 50 dB.
• Constructed with sound-absorbing materials for optimal noise reduction.
• Weight: 12 kg.

Note: The muffler's design ensures a balance between noise reduction and exhaust flow efficiency.

• Maximum exhaust flow rate: 450 liters per second at 6000 RPM.
• Average flow rate at idle: 50 liters per second.
• Flow rate optimized for the N63B44 engine's output.
• Backpressure at full load: 0.8 bar.

• Backpressure measured at 0.5 bar at 3000 RPM.
• Exhaust system efficiency: 95% at optimal operating conditions.
• Pressure drop across catalytic converters: 0.2 bar.
• Pressure drop across muffler: 0.1 bar.

Note: Low backpressure ensures minimal impact on engine performance and fuel efficiency.

• Inspect exhaust system every 30,000 km or 24 months, whichever comes first.
• Check for leaks, corrosion, and physical damage during inspections.
• Verify catalytic converter efficiency using diagnostic tools.
• Inspect muffler for internal baffle damage or excessive noise.

• Replace catalytic converters if efficiency drops below 90%.
• Muffler replacement recommended if noise levels exceed 60 dB.
• Exhaust pipes should be replaced if corrosion exceeds 30% of surface area.
• Use only OEM or equivalent parts for replacements.

Note: Regular maintenance ensures optimal performance and compliance with emissions standards.