BMW B58 Pre-OPF 5-Inch Stainless Steel Downpipe | G-tech Motorsports
BMW B58 Pre-OPF 5-Inch Stainless Steel Downpipe | G-tech Motorsports
Estimated deliver: 5 -7 Days from order date.
Description
Improve the performance and sound of your BMW B58 engine with the G-tech Motorsports 5-inch stainless steel downpipe for Pre-OPF models. The oversized high-flow design removes the restrictive factory downpipe to deliver faster turbo spool, sharper throttle response and a deeper, more aggressive exhaust tone for both road and track use.
Key Features & Benefits:
- Oversized 5-inch diameter for maximum exhaust flow
- Premium T304 stainless steel for durability and corrosion resistance
- Mandrel-bent tubing for smooth airflow and faster turbo response
- Integrated heat shield to lower engine bay temps
- Motorsport-grade TIG welding for strength under high boost
- Deep, aggressive exhaust tone compared to OEM pipes
- Brushed stainless finish for a performance look
Vehicle Compatibility / Fitment:
Fits BMW B58 Pre-OPF models:
- M140i (F20/F21)
- M240i (F22/F23)
- 340i (F30/F31/F34)
- 440i (F32/F33/F36)
- 540i (G30 – Pre-OPF only)
- 740i (G11/G12 – Pre-OPF only)
- X3 B58 (G01 – Pre-OPF only)
Technical Specifications:
- Diameter: 5-inch inlet tapering to OEM connection
- Material: T304 stainless steel
- Finish: Brushed stainless
- Construction: TIG welded
- Heat Shield: Integrated
Installation Information:
- Tools required: Standard exhaust tools, torque wrench
- Install time: 1–2 hours
- Professional fitting: Recommended for best results
Performance Gains / Why It’s Needed:
The stock downpipe restricts exhaust flow. G-tech’s 5-inch design delivers:
- Stock cars: +25–30bhp and sharper throttle response
- Stage 2: Up to +120bhp with ECU remap
- Hybrid / big turbo: Supports 700hp+ builds
- Benefits: Lower exhaust gas temps and quicker spool throughout the rev range
What’s Included:
- 1x 5-inch stainless downpipe
- Integrated heat shield
- Full installation hardware
Warranty & Guarantee:
Comes with manufacturer warranty and return policy on unused products.
FAQs:
Q: Why choose 5-inch over 4.5-inch?
A: More exhaust flow, ideal for tuned and big turbo setups.
Q: Is this for Post-OPF engines?
A: No, only Pre-OPF B58 models.
Q: Do I need a remap?
A: Gains are best with Stage 2 tuning, but it also works on stock software.
Q: Will it change the exhaust sound?
A: Yes, expect a deeper and more aggressive tone.