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JHM ECU Tuning for C5-allroad (04-05 with BAS Engine Code) 4.2L V8

SKU: JHM-C5allroad42LTU

Availability: In stock


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Introducing JHM Tuning for the C5-allroad with the 40v 4.2l V8!!!

IMPORTANT: After purchase you must go to your "Account" and then click "My Downloadable Products" on the left to download the Flash Server access form. Fill this out completely and then email to to receive detailed instructions, software and your account credentials.

If you are looking for the ultimate in tuning for your C5-allroad whether it is an Automatic or Manual transmission, you are in the right place.

Why is our tuning the BEST? Our tuning is specifically designed for an aftermarket exhaust. It is not another "cookie cutter" software that will work on a stock car, thus limiting its abilities.

The minimum required for your exhaust system is as follows:
-Downpipes: Piggie downpipes (which we sell) are good. Aftermarket downpipes like the Fast Intentions 2.5 inch downpipes we sell are better. Our JHM Longtube Headers are the best setup. However, you will need to do some minor modifications to run our Fast Intentions Downpipes or our JHM Headers on your C5-allroad.
-Cat-back: You must have a high-flow, dual 2.5 inch cat-back with an X-pipe. The Magnaflow cat-back we offer for the C5-A6 2.7T is the most convenient solution for a C5-allroad 4.2L. With slight modifications it will bolt right up to your allroad.

In typical JHM style here are some videos of the performance our tune is capable of producing on the B6-B7 S4 Platform with a very similar engine:

VIDEO JHM 12.97 @ 109.1 All-motor and Bolt-on parts quarter mile pass:

VIDEO of a JHM customer's B6-S4 (13.03 @ 105.9mph in the quarter mile) with JHM Tuning:

VIDEO of a JHM tuned V8 S4 pulling away from a stage 2 B5 S4 and one of the first JHM Longtube Header equipped V8 S4s:

VIDEO JHM burnouts and abuse with our B6-S4:

OPTIONS: When you place your order for JHM Tuning, please specify your year by using the drop down box below.

For Flashing Method, select "Flash Myself, SEPARATE Cable Purchase Required, CLICK LINK BELOW" if you're going to be buying a cable from us and flashing your car on your own. You'll need to add this option.


and add to your cart after adding the tune, just selecting the option is NOT enough. Make sure you have THOROUGHLY read through the instructions and are confident that you can set your computer up correctly. If you select this option for your tune, you must select a shipping method for your order so we can ship you a JHM Tuning-Flashing Cable. Please select a shipping method once you've added the tuning and the flashing cable to your cart. Instructions for installing the flashing software on your computer will be emailed to you after purchase.

If you already have a JHM Tuning-Flashing Cable, select "I already have a JHM Tuning-Flashing Cable." **NOTE: This is a proprietary cable manufactured by APR with drivers specific to our Flashing Software so you must make sure that you have a JHM Tuning-Flashing Cable, NOT just a generic USB Vag Com cable.** After receiving your paid order, we will send you an authorization form which we will use to create your JHM Tuning Flash Browser account and login information. This is the information you will use to access our server and flash your car with the JHM Tuning-Flashing Cable that you already have.

DISCLAIMER: JHM is now using proven flashing technology in order to get our tunes on our customers' cars in the quickest and most convenient way possible. You will be installing two separate programs on your computer: VPN software to access our flashing server securely and our JHM Tuning Browser which is the program that writes the JHM Tune onto your car. Both of these programs are highly specific when it comes to configuring your computer to run them properly. While every effort has been made to clearly and completely explain this configuration in our instructions, the customer will ultimately be responsible for removing or disabling their own or third party anti-virus software or firewalls that will block the port required for you to log into our flashing server (see the link to our instructions below to determine whether or not this is something you'll be able to do). Basic technical support provided by JHM to help install these programs on your computer, diagnose programs with your computer, and/or internet connection may be subject to an hourly fee. Additionally, if something happens to your ECU during the flashing process, you should be able to restore it using our software. If you are still unable to make the ECU flash properly, you will be responsible for all costs associated with restoring your ECU and fixing the issue.

Requirements for Tune:
- Windows computer with at least 1 USB (Universal Serial Bus) port
- Wired Broadband Internet Connection (wireless can be unreliable)
- JHM Tuning-Flashing Cable (Flash cable length cannot extend beyond 10 ft long unless a powered USB hub is installed in-line.
- Battery Charger or equivalent power source capable of sustaining a 40 amp charge

You can download and view the instructions at to determine whether or not this is something you would like to do.

If you would like to get tuned at our location in Lathrop, CA please give us a call to schedule an appointment! If you'd like to get tuned at a JHM dealer close to your location, you can find one using our Dealer Map by clicking the "Dealers" Tab at the top of this page. You will need to contact your preferred dealer directly and schedule a tuning appointment with them. You shouldn't be charged more than an hours' worth of labor for your JHM Flash.

Our dealer network is large and growing daily. If we do not have a dealer within an hour drive of your location, we will do everything possible to build a new relationship with a shop close to you on your behalf. Please contact us for more information.

DO NOT SHIP YOUR ECU TO JHM without contacting us first!!!

NOTE for customers with an ECU that already has brand-x software:

**UPDATE, 10-1-2012:** JHM Flash Tuning technology will overwrite **most** previous tuning on your ECU. If you're already tuned with a poorly performing, "brand-x" ECU tune you do not need to worry about it interfering with the process for becoming JHM Tuned. However, if another company has installed a soldered on board like we used to, you will not be able to flash over that. In these cases, the customer will be responsible for all additional labor charges, shipping costs, etc. required to convert the ECU back to stock to allow it to be flashed.

Any previously tuned JHM ECU with a solder on board can be converted back to stock. This will allow the customer to convert to JHM Flash Technology. Previously tuned JHM ECU customers will need to send their ECU to JHM to have it converted to stock and then have the stock ECU installed in their car and tuned via JHM Flash Technology. If you go to a JHM Dealer to have your ECU removed, you will be responsible for all associated labor and shipping costs charged by the dealer. If you plan on flashing your car on your own, you will need to pay for a flashing cable as well.

NOTE For MANUAL CONVERSION tunes only. After flashing you MUST recode your ECU, ABS module and instrument cluster appropriately. JHM will provide the recoding settings to do with VCDS (Vag-com) for all but ECU. MT conversion ECUs must come to JHM for coding to be manually forced for the ECU software to work properly. CUSTOMER MUST FLASH IT FIRST BEFORE SENDING TO US AND GET CAR UP AND RUNNING. Customer is responsible with shipping to and from us and this is specified on our product page.
NOTE: Our MT swap tune is maximized for the B6-B7 S4 0A3 transmission due to its better ratios for a NA V8. Search for "allroad 0a3 swap" to find the full parts list and JHM parts needed for this conversion.

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 allroad C5 (2001-2005) 4.2l V8 40v
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You're reviewing: JHM ECU Tuning for C5-allroad (04-05 with BAS Engine Code) 4.2L V8
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.

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