Single Turbo Downpipe Exhaust For 2011-2012 BMW 135i E82 E88 E90 E92 N55 B30

SKU: XKV21064
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$175.11 $128.61 SAVE $46.50
Fitment & Specs
Fits selected 2011–2012 BMW N55 single-turbo applications, including E82 / E88 135i and E90 / E91 / E92 / E93 335i models. Verify model year, chassis, engine, turbo setup, catalytic converter configuration, and exhaust connection before purchase.
T304 Stainless Steel · Single Turbo Downpipe
Before You Buy: Off-road/racing use only · Professional install recommended
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Description

This single turbo downpipe exhaust is designed for page-listed 2011–2012 BMW N55 3.0L applications, including BMW 135i E82 / E88 and BMW 335i E90 / E91 / E92 / E93 models shown in the fitment table below. It is intended as a racing / de-catalyzed downpipe component for compatible BMW N55 single-turbo exhaust layouts.

Built from T304 stainless steel with mandrel-bent tubing, CNC-machined flanges, TIG/MIG welded construction, and a de-catalyzed downpipe layout as listed, this downpipe is designed to support a freer exhaust path where compatible. Final fitment, sound, exhaust sealing, turbo response, drivability, and performance results may vary depending on vehicle condition, chassis, turbo setup, O2 sensor configuration, installation quality, tuning or calibration, emissions setup, and supporting exhaust components.

Product Overview

This product is a single turbo racing downpipe for compatible BMW N55 3.0L applications. It is not a header set, catback exhaust system, full turbo-back exhaust, catalytic converter, twin-turbo N54 downpipe set, or universal pipe kit. Please verify your exact model year, chassis, N55 engine, turbo setup, O2 sensor layout, flange connection, downstream exhaust connection, and emissions requirements before purchase.

Key Details

  • Fitment: Page-listed 2011–2012 BMW 135i and 335i N55 applications
  • Engine: BMW N55 B30 3.0L single-turbo engine as listed
  • Product Type: Single Turbo Racing Downpipe Exhaust
  • Design: De-catalyzed / racing downpipe design as listed
  • Material: T304 stainless steel as listed
  • Construction: CNC-machined flanges with TIG/MIG welded construction as listed
  • Pipe Design: Mandrel-bent tubing as listed
  • Connection: Designed for compatible BMW N55 turbo outlet and downstream exhaust connection where fitment matches
  • Installation: Professional installation highly recommended
  • Instruction: No installation instructions included unless otherwise stated on the product page
  • Use Case: Off-road, racing, or closed-course use where emissions laws apply

Fitment

Please use the table below to quickly confirm the main vehicle applications currently listed for this BMW N55 downpipe. Before ordering, verify your exact chassis, engine, turbo setup, O2 sensor layout, flange connection, downstream exhaust layout, and emissions setup.

Vehicle Name Year Engine Notes
BMW 135i E82 / E88 2011–2012 N55 3.0L Single Turbo Verify chassis, turbo outlet connection, O2 sensor layout, and downstream exhaust connection
BMW 335i E90 / E91 / E92 / E93 2011–2012 N55 3.0L Single Turbo Verify exact chassis, N55 engine, flange connection, O2 sensor layout, and exhaust setup
Fitment Note: This table is based on the fitment information currently listed for this product. This downpipe is intended for page-listed BMW N55 single-turbo applications only. It is not listed as an N54 twin-turbo downpipe set. Please verify your exact model year, chassis, N55 engine, turbo setup, O2 sensor layout, flange connection, downstream exhaust layout, and emissions setup before purchase.

Package Includes

  • Single turbo downpipe component as shown
  • Flange / welded connection sections as shown or listed
  • Gaskets, clamps, hardware, bolts, or additional accessories included only if shown or listed

Please review the product photos and listing details before installation. Confirm all included downpipe components, flanges, gaskets, clamps, fasteners, and O2 sensor provisions against the received package before beginning installation.

Installation Notes

  • Professional installation is highly recommended.
  • No installation instructions are included unless otherwise stated on the product page.
  • Test fit the downpipe before final tightening.
  • Verify turbo outlet connection, flange alignment, O2 sensor position, and downstream exhaust connection before installation.
  • Check clearance around the turbocharger area, firewall, transmission area, heat shields, underbody, wiring, O2 sensor harnesses, and surrounding exhaust components.
  • Old, rusted, or seized factory hardware may increase installation difficulty.
  • Catless / de-catalyzed downpipe installation may require compatible tuning, calibration, or sensor-related solutions depending on vehicle setup.
  • Inspect all exhaust connections for leaks after installation and recheck clamps / fasteners after initial heat cycles where appropriate.

Before You Buy

  • This product is intended for page-listed 2011–2012 BMW 135i and 335i N55 single-turbo applications only.
  • This is a single turbo racing downpipe, not a header set, catback exhaust system, full turbo-back exhaust, catalytic converter, N54 twin-turbo downpipe set, or universal pipe kit.
  • Please verify your exact model year, chassis, N55 engine, turbo setup, O2 sensor layout, flange connection, downstream exhaust connection, and emissions setup before purchase.
  • This product uses a de-catalyzed / racing downpipe design as listed and may alter or remove emissions-related exhaust components depending on the vehicle setup.
  • Compatible tuning, calibration, or sensor-related solutions may be required depending on O2 sensor configuration and ECU setup.
  • This product is intended for off-road, racing, or closed-course use where emissions laws apply.
  • This product is not represented as street legal, emissions-compliant, CARB-compliant, or legal for public road use unless explicitly stated.
  • Performance gains, sound changes, exhaust flow changes, turbo response, fitment, and drivability results are not guaranteed and may vary by setup.
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.