Racing 4" Downpipe Exhaust for 2015-2019 BMW N55 F01 F02 740i F10 F11 F15/F07 535i F06 F12 F13 640i E70 E71 X5 X6
- 3 items → Extra 5% off
- 5 items → Extra 7% off
- 7 items → Extra 9% off
Experience the perfect blend of quality engineering and exceptional value with these high-performance headers. Manufactured from durable T-304 stainless steel with precision CNC-machined flanges and TIG/MIG welded construction, they deliver superior durability and flow characteristics. Computerized mandrel bending technology ensures smooth exhaust airflow for improved scavenging and reduced back pressure.
Features:
- Inlet/ Outlet Size: 4"/ 3.15"
- Made from handcrafted, tig welded 304-grade stainless steel
- Direct bolt-on application
- Smooth radius bends to decrease turbulence and increase flow
- CNC SS304 stainless steel flange
- Gains from 25 – 30hp with a tune
- For 2015+ BMW 535i & 535ix F10 & F11
- For 2015+ BMW 535i GT & 535ix Gran Turismo F07
- For 2016+ BMW 640i F06 F12 & F13 Coupe & Convertible
- For 2014+BMW X5 35iX F15
- For 2015+BMW X6 35iX F16
Product Note: Professional installation recommended
Vehicle Fitment
| VEHICLE MODEL | YEAR | CHASSIS / BODY |
|---|---|---|
| BMW 535i / 535ix | 2015+ | F10 / F11 |
| BMW 535i GT / 535ix Gran Turismo | 2015+ | F07 |
| BMW 640i Coupe / Convertible | 2016+ | F06 / F12 / F13 |
| BMW X5 35iX | 2014+ | F15 |
| BMW X6 35iX | 2015+ | F16 |
Smaller-diameter tubing, tight bends VS 4-inch large-diameter, mandrel-bent tubing
Limits exhaust flow and creates excessive backpressure VS Smooth flow path with significantly reduced backpressure
Exhaust restriction constrains turbo spool speed VS Faster turbo spool with improved throttle response
Stock low-key exhaust tone VS More aggressive exhaust tone
Constrains airflow and reduces engine’s performance potential VS Noticeable gains in horsepower and torque, unlocking stronger performance
Performance & Reliability
Proven Quality
Each downpipe undergoes rigorous dyno testing and CFD optimization to achieve optimal exhaust scavenging and flow efficiency. Pressure-tested for durability and engineered to withstand elevated exhaust temperatures in performance-tuned N55 engines.
Complete installation kits include all required gaskets, hardware, and detailed instructions for precise fitment.
Why Choose Samexhaust
Made from premium stainless steel/aluminum (depending on model) to resist corrosion and withstand high temperatures under long-term operation.
Manufactured in our own facility and stocked in the U.S. for quick nationwide delivery — no middleman markups.
By removing EGR restrictions, this kit improves engine efficiency, reduces carbon buildup, and enhances throttle response, offering a clean, reliable, and cost-effective performance upgrade.
Dedicated customer support to guide you from selection to installation.
Frequently Asked Questions
What is this 4" racing downpipe?
This is a high-performance 4-inch racing downpipe designed for BMW vehicles equipped with the N55 turbocharged engine. It replaces the restrictive factory downpipe to significantly improve exhaust flow, turbo response, and overall performance.
What performance gains can I expect?
When paired with proper ECU tuning, this downpipe can support gains of approximately 25–30 horsepower. The larger 4-inch inlet and smooth mandrel bends help reduce back pressure and improve turbo efficiency.
Is tuning required?
Yes. ECU tuning is highly recommended to fully realize the horsepower gains and to ensure proper engine operation after upgrading to a high-flow racing downpipe.
Is this a direct bolt-on installation?
Yes — this downpipe is engineered as a direct bolt-on upgrade using factory mounting locations. No cutting or fabrication is required. Professional installation is recommended.
What materials and construction are used?
The downpipe is constructed from handcrafted TIG-welded T304 stainless steel with CNC-machined stainless steel flanges. Smooth-radius mandrel bends reduce turbulence and maximize exhaust flow and durability.
Will this change the exhaust sound?
Yes — expect a louder, deeper, and more aggressive exhaust note with improved turbo spool sound, especially under acceleration and wide-open throttle.
Which vehicles does this downpipe fit?
This downpipe fits the following BMW N55-equipped models:
• 2015+ BMW 535i / 535ix F10 & F11
• 2015+ BMW 535i GT / 535ix Gran Turismo F07
• 2016+ BMW 640i F06 / F12 / F13 Coupe & Convertible
• 2014+ BMW X5 35iX F15
• 2015+ BMW X6 35iX F16
Is this downpipe street legal?
No. This racing downpipe is intended for off-road, track, or competition use only. It may not comply with emissions regulations for street-driven vehicles.
Attention
Products on this site are for off-road/racing use only and are not legal for public roads where emissions laws apply.
Professional installation recommended. Removing emissions equipment (DPF, CAT, SCR, DOC) requires deleting related sensors and a compatible tuner to avoid engine codes.
Performance gains may vary—no guarantees.
