Catless Twin Turbo Downpipe Exhaust for 2008-2014 BMW N63 X6/X5 550I 650I 750I B7 N63 B44 4.4L V8

SKU: XKV21071
Availability : In Stock Pre order Out of stock
BUNDLE DISCOUNTS
3 Items 5% Off
5 Items 7% Off
7 Items 9% Off
Discounts applied automatically at checkout
$217.34 $170.90 SAVE $46.44

Guaranteed Safe Checkout

visamasteramerican expressdiscoverpaypal
Product Policy Image
Description

Experience the perfect blend of quality engineering and exceptional value with these high-performance Downpipe Exhaust. 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:

  • Pipe Inlet Diameter: 3"
  • OD Pipe Outlet Diameter: 2.5"
  • OD Pipe Thickness:16 gauge (1.5mm)
  • Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends i.e. Maximizing Smoothest Exhaust Airflow
  • Includes Both Left and Right Downpipes
  • TIG welded CNC Machine Flange for Strength and Durability
  • Increase Engine Output and Efficiency. Gain 10 - 15 HPs (approximately)
  • O2 Sensor Bung Insertions Included
  • Direct Bolt-In Replacement of Catalytic Converter
  • Perforated Core Resonator
  • Integrated Flex Pipe ( Braided & Accordion Style)
  • Professional Installation is Highly Recommended
  • No Instruction Included

Fitment:

  • 11-13 BMW 550i
  • 10-13 BMW 550i GT, xDrive
  • 2012 BMW 650i, xDrive
  • 09-12 BMW 750i, xDrive
  • 09-12 BMW 750Li, xDrive
  • 11-12 BMW Alpina B7, xDrive, B7L, B7L xDrive
  • 10-13 BMW X5
  • 08-14 BMW X6
  • Fits 4.4L Turbocharged Engines Only

VEHICLE NAME YEAR ENGINE
BMW 550i 2011~2013 4.4L
BMW 550i GT 2010~2013 4.4L
BMW 550i GT xDrive 2010~2013 4.4L
BMW 550i xDrive 2011~2013 4.4L
BMW 650i 2012 4.4L
BMW 650i xDrive 2012 4.4L
BMW 750i 2009~2012 4.4L
BMW 750i xDrive 2010~2012 4.4L
BMW Alpina B7 2011~2012 4.4L
BMW Alpina B7 xDrive 2011~2012 4.4L
BMW Alpina B7L 2011~2012 4.4L
BMW Alpina B7L xDrive 2011~2012 4.4L
BMW X5 2010~2013 4.4L
Shipping & Return

SHIPPING & DELIVERY
Fast Processing & Reliable Transit

  • Processing: Orders are processed and shipped from the nearest warehouse within 24 hours.
  • Delivery: Estimated delivery time is approximately 4 to 5 business days.

RETURNS & EXCHANGES
30-Day Hassle-Free Policy

  • Return Window: We offer a 30-day return policy from the date of delivery.
  • Process: To initiate a return or exchange, please contact our customer service team first to receive authorization and instructions.

WARRANTY
2-Year Limited Replacement Warranty

  • Duration: All products are backed by a 2-year limited warranty.
  • Coverage: This warranty covers manufacturing defects and product failures under normal use, and provides a replacement for qualified cases (repairs are not performed).

CUSTOMER SUPPORT
We’re Here to Help – Contact Us First

  • Priority Contact: For any order-related issues—including returns, warranty claims, or general inquiries—please contact us first before taking further action. We are committed to resolving your concern promptly.
  • Feedback Notice: If you are unsatisfied, we kindly ask that you allow us an opportunity to address the issue before leaving neutral or negative feedback.
  • Email Support: You can reach us at support@XKVracing.com.

A Key Section in a Turbocharged Exhaust System

The downpipe connects directly to the turbocharger and routes exhaust gases into the rest of the exhaust system. It is one of the first exhaust components downstream of the turbo.

Because of its position, the design of the downpipe influences how exhaust gases move away from the turbo and into the remaining exhaust path.

What Drivers May Observe

More consistent exhaust flow downstream of the turbocharger

Reduced restriction compared to some factory exhaust layouts

Smoother boost delivery under certain operating conditions

Changes in exhaust tone, depending on system setup

Catted vs Catless

Catted Downpipe

Includes a catalytic converter designed for specific applications
Used where emissions considerations or regulations apply
Often selected for vehicles intended for street use, where permitted

Catless Downpipe

Does not include a catalytic converter
Typically intended for off-road, competition, or export use
Used in applications where different regulatory standards apply

Is a Downpipe Right for Your Build?

Own a turbocharged vehicle

Are upgrading intake, intercooler, or exhaust components

Want improved exhaust efficiency and response

Are building a balanced street or track setup

FAST SHIPPING

1-business-day shipping after payment
3-4 business day delivery

Secure and reliable Checkout

Secure PayPal Payments

LOCAL WAREHOUSE

Orders ship from US warehouses

Easy Returns and Exchanges

30-Day Hassle-Free Returns and Exchanges

Parts Warranty

2-Year Warranty

Important Notice

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.

Frequently Asked Questions

What is a downpipe? +
A downpipe is the exhaust section that connects directly to your turbocharger. It replaces the restrictive factory pipe to allow exhaust gases to exit faster, which improves turbo response and can increase power.
What's the difference between catted and catless downpipes? +
Catted downpipes include a high-flow catalytic converter and are designed for street use. Catless downpipes remove the catalytic converter entirely for maximum flow, but are intended for off-road or competition use only.
Will a downpipe increase horsepower? +
Yes. A downpipe is one of the most effective modifications for turbocharged vehicles. It reduces exhaust backpressure, allowing the turbo to spool faster and produce more power, especially when combined with proper tuning.
Do downpipes make the car louder? +
They usually do. You'll typically notice a deeper exhaust tone and more turbo whistle. Catless downpipes tend to be significantly louder and more aggressive than catted versions.
Do I need tuning after installing a downpipe? +
Tuning is strongly recommended. It helps maximize performance gains and prevents potential issues like check engine lights or improper air-fuel ratios that can occur with increased exhaust flow.
Are downpipes street legal? +
This depends on the design and local regulations. Catted downpipes with proper certifications may be street legal. Catless downpipes are generally not legal for street use. Always verify with your local emissions laws before installation.
Can I use a downpipe with my stock exhaust system? +
Yes. Downpipes are designed to connect to either stock or aftermarket exhaust systems. You will still experience performance benefits even with the rest of the exhaust remaining stock.
Are downpipes hard to install? +
Installation difficulty varies by vehicle. Some are straightforward bolt-on installations, while others may require more time and tools due to limited space around the turbocharger area.
Will a downpipe affect reliability? +
When properly installed and tuned, quality downpipes are generally reliable. They reduce exhaust backpressure, which can help lower turbo temperatures and potentially extend component life.