B21, China Town Mall, Midrand
4 inch Stainless Steel Catless Downpipe For BMW 1er 3er 4er 335i 435i N55 2013
- Section : Sports & Entertainment
- Category : Vehicle Parts & Accessories
- SKU : 1600360043857
Overview
Application
For BMW F30 335i 335i xDrive - Sedan 2014-
For BMW F32 435i 435i xDrive - Coupe 2014-
For BMW F33 435i Convertible 435i xDrive Convertible 2014-
For BMW F34 335i xDrive GT - Gran Tourismo 2014-
For BMW F36 435i Gran Coupe 435i xDrive Gran Coupe 2014-
Feature
Condition: 100% Brand new
Warranty: 2 year
Material: 201 grade stainless steel, anti-magnetic and not easy to get discolouration.
TIG welding: super strong , prevent cracking, and long-lasting durability
Flanges :CNC machined for strong, solid support and an accurate fit
Surface: Hand polished mirror polished.
Integrated flexi section: helps reduce exhaust strain
Smooth and deep tone sound
Installation notice：Direct fit bolt on, no modification needed, to ensure the correct fitment, we highly recommend you find a professtional mechanic to help you install it.
Specification
| Product Specific | Downpipe diameter : 4 inch / 102mm 1 X Downpipe Decat Pipe |
| Product Function | Designed to improve power and torque across the entire RPM range Noticeably improves throttle response One of the most cost effective ways of releasing power from your car With this Down Pipe between the turbocharger and the exhaust system, it could Increase both power and acceleration, the turbocharger can work better more efficiently and the exhaust gas temperature decreases significantly. achieve a significantly increased engine power and a higher torque. you can achieve a distinctive exhaust sound.Noticeable performance increase |
- Shipping Timeframes: All orders are processed within 2-5 business days (excluding weekends and holidays). After your order has been processed, the estimated delivery time is before 03 Feb, 2026, depending on customs, Please note that due to high demand, some items may experience longer shipping times, which will be communicated at order confirmation email.
- Order Processing Time: Please allow 2-5 business days for us to process your order before it is shipped . Orders placed after 16:00 on Fridays, or during weekends and public holidays, will begin processing on the next business day. Processing times may be extended during peak seasons or sales events.
- Manufacturing Time: Some products needs manufacturing time, the manufacturing process will take approximately 10-30 business days depending on the product. This timeframe may vary depending on the complexity of the product and current demand. but this will be communicated with you during order confirmation.
- Returns and Exchanges: We offer a 30-day return policy for most items. If you are not completely satisfied with your purchase, you may return it within 30 days of receipt for a refund or exchange. Items must be unused, in their original packaging, and accompanied by proof of purchase. Return shipping costs are the responsibility of the customer, unless the item was damaged or defective upon arrival.
1. Which BMW models and years does this 4" catless downpipe fit?
This downpipe is listed for BMW N55 models: F30 335i / 335i xDrive (Sedan) 2014, F32 435i / 435i xDrive (Coupe) 2014, F33 435i / 435i xDrive (Convertible) 2014, F34 335i xDrive GT (Gran Turismo) 2014, and F36 435i / 435i xDrive Gran Coupe 2014. Always verify fitment with your VIN or consult the seller—some listings reference 2013/2014 ranges, so confirm exact compatibility before purchase.
2. What material and construction does the downpipe use?
Made from 201-grade stainless steel with hand-polished mirror finish. It features TIG welding for strong, crack-resistant seams and CNC-machined flanges for accurate fitment. An integrated flex section reduces exhaust strain.
3. What is included in the package?
The package includes one 4" (102 mm) stainless steel downpipe (decat pipe). It typically includes the machined flanges and the integrated flex section. Gaskets, bolts, or O2 sensors are not guaranteed—check the seller listing or ask before purchase.
4. What performance improvements can I expect?
A catless 4" downpipe can improve turbo efficiency, throttle response, and increase power and torque across the rev range by reducing exhaust restriction and lowering exhaust backpressure/EGTs. Actual gains vary by vehicle, supporting modifications, and tuning—no specific HP numbers are guaranteed.
5. Will I need an ECU tune after installing this downpipe?
A tune is highly recommended to optimize air/fuel, reduce the risk of limp-mode or poor drivability, and to take full advantage of the downpipe. In many cases a tune is also needed to prevent or address check engine lights caused by changed O2 sensor readings.
6. Will installing a catless downpipe trigger a check engine light (CEL)?
Yes, removing catalytic converters often changes downstream O2 sensor readings and can trigger CELs and emissions-related codes. Solutions include ECU tuning, O2 sensor reprogramming/emulators, or using appropriate hardware—but results depend on the vehicle and local regulations.
7. Is a catless downpipe legal in my area?
Laws vary by country, state, and province. Catless downpipes are illegal for road use in many regions because they remove emissions controls and will often cause a vehicle to fail emissions inspections. Check local laws and smog requirements before installing.
8. How does the sound change after installing this downpipe?
Expect a deeper, freer-flowing exhaust tone with increased turbo and mid/high RPM noise. The car will generally sound louder and more aggressive, especially under boost and wide-open throttle.
9. Is this a direct bolt-on installation?
The listing states direct fit bolt-on with no modification required. However, you should have a professional mechanic perform the installation to ensure correct alignment, proper flange torque, and sealing. Additional hardware or gaskets may be needed.
10. Will this fit AWD (xDrive) versions?
Yes—the product description specifically lists compatibility with the xDrive variants noted (e.g., 335i xDrive, 435i xDrive) for the model years advertised. Confirm fitment for your exact chassis and production date.
11. Does the downpipe include O2 sensor bungs or hardware for sensors?
The description does not explicitly state O2 sensor bungs are included. Many downpipes either include sensor ports or require you to transfer OEM sensors. Confirm with the seller whether O2 bungs/ports and stock sensors are accommodated.
12. What warranty and support are provided?
This product includes a 2-year warranty against manufacturing defects. Warranty typically excludes damage from improper installation, misuse, racing, or modifications. Contact the seller for full warranty terms and claim procedures.
13. What maintenance is required for the downpipe?
Inspect flange bolts and flex section periodically for leaks or looseness. Keep the polished surface clean with non-abrasive stainless steel cleaner. Check welds and sensor ports after heat cycles. Replace gaskets and hardware as needed during reinstallation.
14. Should I take any heat-management precautions?
Catless downpipes can alter heat distribution. Consider heat shielding, ceramic coating, or heat wrap to protect nearby components and reduce under-hood temperatures. Proper heat management can also help prolong sensor and wiring life.
15. What should I do before buying to ensure correct fitment and installation?
Verify fitment by providing your VIN to the seller or checking part compatibility with your exact chassis and production date. Ask whether O2 sensor ports, gaskets, and hardware are included. Plan for professional installation and consider a tune and local emissions/legal restrictions before installing.
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