BMW B58 Downpipe Bmw B58 M140, M240i, M304i, M440i, G01( NON OPF model)

Unlock your BMW B58 engine’s full potential with the G-tech Motorsports Stainless Steel Downpipe. Designed for Pre-OPF B58 models, this downpipe improves turbo spool, increases power, and delivers a more aggressive exhaust tone while maintaining reliability.

Key Features & Benefits

• Material: T304 high-grade stainless steel for strength and corrosion resistance
  
  

• Flow efficiency: Mandrel-bent tubing reduces backpressure for improved turbo response
  
  

• Thermal management: Integrated heat shield lowers under-bonnet temperatures
  
  

• Construction: Fully TIG welded for durability under extreme conditions
  
  

• Sound upgrade: Deeper, aggressive exhaust note without extra modifications
  
  

• Visual finish: Brushed stainless steel for a clean motorsport look
  
  

Vehicle Compatibility / Fitment

Compatible with BMW B58 Pre-OPF engines:

• M140i (F20/F21)
  
  

• M240i (F22/F23)
  
  

• 340i (F30/F31/F34)
  
  

• 440i (F32/F33/F36)
  
  

• 540i (G30)
  
  

• 740i (G11/G12)
  
  

• G01 X3 models (Pre-OPF B58)
  
  

Technical Specifications

• Material: T304 stainless steel
  
  

• Tube design: Mandrel-bent for smooth airflow
  
  

• Finish: Brushed stainless steel
  
  

• Construction: Fully TIG welded
  
  

• Heat shield: Integrated for thermal control
  
  

Installation Information

• Tools required: Standard exhaust tools and torque wrench
  
  

• Estimated install time: 1–2 hours
  
  

• Professional installation recommended for optimal fit and performance
  
  

Performance Gains / Why It’s Needed

The OEM downpipe restricts flow, creating backpressure that slows turbo spool and reduces efficiency. The G-tech B58 downpipe improves exhaust flow, lowers EGTs, and allows the turbo to spool faster. Stock vehicles gain +20–25bhp, and tuned setups can see up to +120bhp with proper remap or Stage 2 tuning.

What’s Included in the Kit

• 1x T304 stainless steel downpipe
  
  

• Integrated heat shield
  
  

• All necessary hardware for fitment
  
  

Warranty & Guarantee

• Covered by manufacturer warranty
  
  

• Returns accepted on unused products in original packaging
  

Perfect BMW B58 exhaust upgrade, Pre-OPF turbo performance part, and BMW tuning accessory. Works with stock or modified exhaust systems for enhanced throttle response, power, and sound.

FAQs

Q1: Is this compatible with B58 Post-OPF models?

No, this downpipe is designed for Pre-OPF B58 engines only.

Q2: Will installation affect my warranty?

Professional installation is recommended to maintain proper fitment and avoid warranty issues.

Q3: Can this be used with a Stage 2 tune?

Yes, performance gains are maximized with ECU tuning.

Q4: Does it fit all B58 models listed?

Yes, verified for M140i, M240i, M340i, M440i, 540i, 740i, and G01 Pre-OPF models.

Q5: Does it improve sound?

Yes, it gives a deeper, more aggressive exhaust tone with better turbo response.