BMW N63 4.4L V8 Catless Downpipes – 550i/GT, 650i, 750i/750Li, X5/X6 & Alpina B7

Name: BMW N63 4.4L V8 Catless Downpipes – 550i/GT, 650i, 750i/750Li, X5/X6 & Alpina B7
Brand: XKVracing
SKU: XKV21071
Price: 170.9 USD
Availability: InStock

SKU: XKV21071

Availability : In Stock Pre order Out of stock

~~$217.34~~ $170.90 SAVE $46.44

Fitment & Specs

Select BMW N63/N63B44 4.4L applications: 2011-13 F10 550i, 2010-13 F07 550i GT, 2012 F12/F13 650i, 2009-12 F01/F02 750i/750Li, 2011-12 B7, 2010-13 E70 X5 and 2008-14 E71 X6; excludes M/S63 applications.

3" Inlet · 2.5" Outlet

T304 Stainless Steel · Professional Installation Recommended

Before You Buy: Off-road/racing use only · Professional install recommended

✓Secure Checkout · ✓Free Shipping ✓3–4 Day Delivery · ✓30-Day Returns · ✓Warranty

Bundle More Parts, Save More

Discounts auto-apply at checkout when eligible

Buy 3 items → Extra 5% off
Buy 5 items → Extra 7% off
Buy 7 items → Extra 9% off

Pay securely with PayPal, Shop Pay, Apple Pay, Google Pay, or major credit cards.

Description
Shipping & Return

Description

BMW N63 Catless Downpipes

Catless Downpipe Pair for BMW N63 4.4L Twin-Turbo Applications

T304 stainless steel catless downpipes designed for the listed BMW N63B44 4.4L V8 twin-turbo applications. This set includes both left and right downpipes with 3-inch inlets, 2.5-inch outlets, integrated O2 sensor bungs and flex sections.

Product Type Catless Downpipe Pair

Inlet / Outlet 3" / 2.5"

Material T304 Stainless Steel

Key Details

Catless N63 Downpipe Design

Designed for the listed BMW N63B44 4.4L V8 twin-turbo applications
Catless downpipe configuration
Includes both left and right downpipes
3-inch inlet diameter
2.5-inch outlet diameter
Integrated O2 sensor bungs

Material & Construction

T304 stainless steel construction
16-gauge / 1.5 mm pipe wall thickness
CNC-machined flanges
TIG-welded construction
Mandrel-bent tubing
Integrated braided and accordion-style flex sections
Perforated-core resonator sections as listed

Vehicle Fitment

Confirm Your BMW Model, Year & Chassis

Vehicle	Chassis	Year	Engine
BMW 550i / 550i xDrive	F10	2011-2013	N63 4.4L V8
BMW 550i GT / GT xDrive	F07	2010-2013	N63 4.4L V8
BMW 650i / 650i xDrive	F12 / F13	2012	N63 4.4L V8
BMW 750i / 750Li	F01 / F02	2009-2012	N63 4.4L V8
BMW Alpina B7 / B7L / xDrive	F01 / F02	2011-2012	4.4L V8 Twin Turbo
BMW X5	E70	2010-2013	N63 4.4L V8
BMW X6	E71	2008-2014	N63 4.4L V8

Important Fitment Notes:

Designed for the listed BMW N63 / N63B44 4.4L V8 twin-turbo applications only.
Does not fit BMW M5, M6, X5 M or X6 M applications equipped with S63 / S63TU engines.
Generic model names such as 550i, 650i, 750i, X5 or X6 are not enough to confirm fitment. Verify the exact model year, chassis and engine before purchase.
Later N63-family applications may use a different downpipe-to-exhaust connection and are not automatically interchangeable with this set.
Compare the factory downpipe connection and O2 sensor layout with the product photos before ordering.

Package Includes

1 × Left catless downpipe
1 × Right catless downpipe
Gaskets as supplied
Bolts / installation hardware as supplied

Compare all supplied components with the product photos and factory exhaust components before beginning installation.

Installation & Fitment Checks

Before Installation

Confirm the exact vehicle year, model, chassis and N63 engine.
Verify the factory downpipe-to-exhaust connection.
Confirm O2 sensor routing and connector locations.
Inspect the downstream exhaust connection and available clearance.
Compare the supplied left and right downpipes with the factory components before installation.

Installation Notes

Professional installation is highly recommended.
Use the appropriate BMW service or workshop information during installation.
Existing exhaust hardware and seals should be inspected before installation.
Test fit both downpipes before final tightening.
Additional vehicle-specific adjustment may be required depending on the existing exhaust configuration.
Inspect all exhaust connections for leaks after installation.

Before You Buy

This is a left-and-right catless downpipe pair for the listed BMW N63 / N63B44 4.4L V8 twin-turbo applications.
Fitment varies by model and year. Review the complete fitment table above rather than relying on the broad 2008-2014 vehicle range.
Does not fit BMW M5, M6, X5 M or X6 M / S63 applications.
Verify chassis, engine, O2 sensor routing and downpipe-to-exhaust connection before ordering.
Later N63-family vehicles are not automatically compatible simply because they use an N63-family engine.
This product replaces the factory catalytic downpipe sections. Check applicable emissions and road-use requirements before purchase and installation.

Shipping & Return

SHIPPING & DELIVERY
Fast Processing & Reliable Transit

Processing: Orders are processed and shipped from the nearest available warehouse within 1 business day after payment.
Delivery: Estimated delivery time is approximately 3–4 business days after shipment.
Shipping - Free shipping on all orders within the contiguous 48 U.S. states.

RETURNS & EXCHANGES
30-Day Hassle-Free Policy

Return Window: We offer a 30-day return policy from the date of delivery.
Item Condition: Returned items should be unused, uninstalled, and in their original packaging when possible.
Return 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.

Downpipe Buying Guide

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

Ships within 1 business day after payment
3–4 business day delivery

Secure and Reliable Checkout

Secure checkout with major payment options

LOCAL WAREHOUSE

Orders ship from U.S. warehouses when available

Easy Returns and Exchanges

30-day returns for eligible unused items

Parts Warranty

Warranty support for qualified manufacturing defects

Important Notice

Products on this site are intended for off-road, racing, or closed-course use where emissions laws apply. They are not represented as street legal, emissions-compliant, or legal for use on public roads unless explicitly stated.

Some products may remove, replace, relocate, disable, or alter emissions-related components, including but not limited to catalytic converters, EGR, DPF, SCR, DOC, O2 sensors, or related factory systems. Compatible tuning, calibration, or supporting modifications may be required to avoid engine codes or drivability issues.

Professional installation is recommended. Buyers are responsible for verifying product compatibility, local regulations, emissions requirements, and any required tuning or supporting modifications before purchase and installation.

Performance gains, sound changes, airflow improvements, temperature changes, fuel economy changes, fitment, and drivability results may vary. No specific performance gains are guaranteed.

Downpipe FAQs

What is a downpipe? +

A downpipe is the exhaust section that connects to the turbocharger and routes exhaust gases toward the rest of the exhaust system. Depending on the vehicle and product design, an upgraded downpipe may help reduce exhaust restriction and support improved turbo response when paired with the right setup.

What's the difference between catted and catless downpipes? +

A catted downpipe includes a catalytic converter, while a catless or racing downpipe does not include one and may alter or remove emissions-related equipment. Catless or racing downpipes are generally intended for off-road, racing, or closed-course use where emissions laws apply. Always check the product details and local regulations before purchase.

Will a downpipe increase horsepower? +

A downpipe may support improved exhaust flow and power potential when combined with proper tuning and supporting modifications. Horsepower and torque gains are not guaranteed and will vary depending on the vehicle, engine condition, tune, fuel, turbo setup, and overall exhaust system.

Do downpipes make the vehicle louder? +

A downpipe can change exhaust tone and may increase turbo or exhaust sound depending on the vehicle, whether the downpipe is catted or catless, and the rest of the exhaust system. Final sound level varies by setup.

Do I need tuning after installing a downpipe? +

Tuning requirements depend on the vehicle, downpipe design, emissions equipment, O2 sensor setup, and supporting modifications. Some applications may require compatible tuning or calibration to support drivability and reduce the chance of warning lights or engine codes.

Will a downpipe trigger a check engine light? +

It may, depending on the vehicle, catalytic converter configuration, O2 sensor location, and ECU calibration. Catless or racing downpipes are more likely to require supporting calibration or sensor-related solutions. Always verify the product notes and tuning requirements before installation.

Are downpipes street legal? +

Street legality depends on the downpipe design, emissions equipment, vehicle application, and local regulations. Catless, racing, or emissions-altering downpipes are generally intended for off-road, racing, or closed-course use where emissions laws apply and are not represented as street legal unless explicitly stated.

Can I use a downpipe with my stock exhaust system? +

Compatibility with a stock exhaust system depends on the vehicle and the specific downpipe design. Some downpipes are designed to connect to factory-style exhaust sections, while others may require compatible aftermarket exhaust parts, adapters, clamps, gaskets, or fabrication. Always check the product fitment and installation notes before ordering.

Are downpipes hard to install? +

Installation difficulty varies by vehicle. Some applications require tight access around the turbocharger, O2 sensors, heat shields, transmission area, or underbody. Rusted factory hardware and limited clearance can also increase installation difficulty. Professional installation is recommended.

Will a downpipe affect reliability? +

Reliability depends on product fitment, installation quality, tuning or calibration, heat management, sensor placement, gasket sealing, fastener condition, and the vehicle’s overall condition. Incorrect installation or mismatched tuning may cause drivability issues.

What should I verify before buying a downpipe? +

Verify your year, make, model, engine, turbo setup, emissions configuration, catalytic converter requirements, O2 sensor layout, flange or clamp connection, exhaust compatibility, and any tuning or calibration needs before purchase.