Air and Fuel› Superchargers, Turbochargers and Components

BorgWarner

K04 Turbocharger, Left-Side Mount

$2,607.83

SKU: 53049880025 / 53049880026

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Overview

The BorgWarner Turbocharger is a K04 upgrade designed for the Audi RS4. This high-flow unit can push the vehicle to 380 HP, providing rapid boost and responsive power. It features a precision-cast turbine housing and a robust billet compressor for heat and pressure resistance. This turbocharger is for the left-side K04 mount.
Show original supplier description
The BorgWarner Turbocharger is a K04 upgrade specifically engineered for the Audi RS4, offering a performance enhancement to achieve up to 380 HP. Constructed with a precision-cast turbine housing and a robust billet compressor, this turbocharger is built to withstand intense heat and pressure, ensuring durability under demanding conditions. This specific unit is designed for the left-side K04 mount, allowing for a seamless swap as a performance upgrade. Key specifications include a power range of 280-380 HP, the K04 turbo model, and compatibility specifically with the Audi RS4. The OEM part number for reference is 078145701M.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandBorgWarner
Part Number53049880025 / 53049880026
CategoryAir and Fuel
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy