Select Vehicle From Dropdown

Turbo or Exhaust Gas Turbocharger, K03, Left or Driver Side (Borg Warner - OEM) for B5-S4, C5 A6-allroad 2.7T

SKU: BOR-078145701S
This is a brand new Borg Warner (OEM) Left or Driver Side K03 Turbocharger for the B5-S4, C5 A6-allroad 2.7T.

If you have had a stock turbo failure, and are looking to get your car back on the road and maintain OEM reliability this the optimal option. However, if you are looking to take this opportunity to add performance with upgraded turbochargers, please go back one section and check out the JHM RS6-RS Turbocharger Kit!

As turbochargers age, the internal seals go bad causing excessive oil in your intercooler or a mixture of oil and coolant. The journal bearings can all wear out, which will cause the compressor fins to touch the compressor housing which generates the infamous "Dentist Drill" sound which is an indicator that the turbo is failing. If you are unsure whether or not you are experiencing turbo failure, do not hesitate to contact us for help! or (209) 968-0077.

OEM Part Number for this turbocharger: 078145701S or 078 145 701 S or 078 145 701S

NOTE: There is a split between years 2002 and 2003 for this turbocharger on the C5 A6 and allroad. This turbocharger will only fit VINs up to 4B-2-200000. If you have a VIN starting with 4B-3-000001 and on this turbocharger will not fit your application. If you need the later style turbocharger, please contact us for pricing.

***Warranty information:***
Borg-Warner warranties any failure due to manufacturer defects for 12 months. In the event that a turbo purchased direct from JHM is not performing to manufacturer specifications, the customer will be responsible for purchasing a replacement until the warranty review process is complete if they are not willing to wait until the review is complete. The malfunctioning part will then be sent out for warranty inspection immediately after it is received by JHM, at which time we will wait to hear from Borg-Warner as to whether the item failed due to manufacturer defects or for other reasons. The most common reasons of a rejected warranty for any turbo but not limited to are: oil pressure and/or feed lines that have excess sludge or deposits in them thus releasing deposits into the turbo and causing failure - oil pressure and/or feed lines that are plugged or partially plugged thus restricting oil to or from the turbo causing failure - damage caused due to improper installation - poorly maintained engines that have oil sludge and deposits that get released into the new turbo. After inspection if the suspected defective turbo is determined to be truly defective by the manufacturer you will be sent back a replacement or refunded for the amount of the replacement you purchased if you bought one in advance as previously stated. (excluding shipping). JHM and Borg-Warner are NOT responsible for the labor costs associated with the install of these items nor the labor costs associated with replacement of warrantable parts. For further information please contact JHM.

For shipping quotes: Please sign in or join then put the items you want in your shopping cart and proceed to checkout

This product fits the following vehicles:
Make Model Chassis Engine
Audi S4 B5 (1997-2002) 2.7t V6 30v
Audi allroad C5 (2001-2005) 2.7t V6 30v
Audi A6 C5 (1998-2004) 2.7t V6 30v
Write Your Own Review
You're reviewing: Turbo or Exhaust Gas Turbocharger, K03, Left or Driver Side (Borg Warner - OEM) for B5-S4, C5 A6-allroad 2.7T
Off-road Use

By Purchasing any Off-Road use ONLY products from JH Motorsports, Inc. I acknowledge and understand the following disclosure. (This notice is located at the bottom of the page description of affected products on our website.)

Vehicle Code § 27156:
(b) No person shall operate or leave standing upon a highway a motor vehicle that is required to be equipped with a motor vehicle pollution control device under Part 5 (commencing with Section 43000) of Division 26 of the Health and Safety Code or any other certified motor vehicle pollution control device required by any other state law or any rule or regulation adopted pursuant to that law, or required to be equipped with a motor vehicle pollution control device pursuant to the National Emission Standards Act (42 U.S.C. Secs. 7521 to 7550, inclusive) and the standards and regulations adopted pursuant to that federal act, unless the motor vehicle is equipped with the required motor vehicle pollution control device that is correctly installed and in operating condition. No person shall disconnect, modify, or alter any such required device.
(c) No person shall install, sell, offer for sale, or advertise any device, apparatus, or mechanism intended for use with, or as a part of, a required motor vehicle pollution control device or system that alters or modifies the original design or performance of the motor vehicle pollution control device or system.

Health and Safety Code § 43000:
43001. The provisions of this part shall not apply to:
(a) Racing vehicles.

As the aforementioned code sections outline, it is against the law to operate or use a vehicle on public streets or highways with modified, altered, or disconnected motor vehicle pollution control devices. This may include but is not limited to, Evaporative Fuel Controls, Catalysts, DPF, PTOX, PCV Systems, Exhaust Gas Recirculation Systems, Oxygen Sensors, Thermostatic Air Cleaners, Air Intake Systems, Fuel Injectors, Regulators, Adjustable Cam Gears, ECU Programming, Mapping, or other Computer Modifications. Air Pumps, Air Injection, Timing, and any other Emission System Modification(s).

Purchaser acknowledges and certifies to JH Motorsports Inc., that Purchasers vehicle will only be used for racing applications or off road vehicle use only. Purchaser requests these modifications for the purpose of enhancing the vehicle for competitive Racing Applications and will not use this vehicle on public streets or highways. Purchaser agrees to indemnify JH Motorsports Inc., all employees, officers, owners, and subsidiaries for any civil or criminal liability arising out of use of Purchasers vehicle on public streets or highways as Purchaser has been duly notified of the laws and regulations regarding disconnecting, alteration, or modification of a vehicle’s pollution control devices. Purchaser understands and has been advised the driving of a vehicle on public streets or highways could result in criminal or civil penalties.

Prop 65

Warning: This product may contain a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm.

Learn More:

Q and A

Product Questions

No questions yet. Be the first to ask the question!