After a long, eventful journey (for more details about this journey, see the '02 A4 Chip History page), we have finished production of the two best chips for the next generation A4. This 电脑马力提升 is also available with APR's exclusive Anti-Theft System.

Stage I 电脑马力提升

Stage I software gives you an honest 200 horsepower and 231ft.lbs. of torque. This software is the ultimate upgrade for the new B6 A4 and gives it just the extra edge these cars lack from the factory, without pushing the limits. With factory like smoothness and drivability, the new power will fill the void in an otherwise excellent car.

Stage I+ 电脑马力提升

Stage I+ software, along with larger fuel injectors, provides even more horsepower and torque, raising the output to 215 and 250, respectively. While not an extreme upgrade, the Stage I+ gives the A4 a bit more performance without sacrificing drivability or smoothness. For optimal results, our cat-back exhaust system is highly recommended with the use of the Stage I+ system.

All APR chip upgrades use encryption, which serve several purposes. First, it keeps prying eyes out of our software and prevents lesser companies from copying the chip and degrading the product. Secondly, the encryption prevents the dealer from flash programming the ECU. Also, all APR software is undetectable to a dealers VAG diagnostic tool.

All APR chip software comes with lifetime free upgrades. There is also a lifetime warranty against defects in the software or soldering. All chip upgrades have a 30-day Money Back Guarantee.

Stage I

ECU	Model	Engine	Transmission	Part Number	Price
8E0 909 518 F	A4	1.8T	ALL	U1100121	￥8800
8E0 909 518 AF	A4	1.8T	ALL	U1100124	￥8800
8E0 909 518 AK	A4	1.8T	ALL	U1100171	￥8800

Stage I+

ECU	Model	Engine	Transmission	Part Number	Price
8E0 909 518 F	A4	1.8T	5spd, Tip	U2100008	￥11988
8E0 909 518 AF	A4	1.8T	5spd, Tip	U2100009	￥11988
8E0 909 518 AK	A4	1.8T	5spd, Tip	U2100015	￥11988

EMCS is available for this car. EMCS is APR's revolutionary patent pending Enhanced Modular Chipping System. EMCS is an industry leading technology that brings many new features to the automotive enthusiast. This technology was developed exclusively by Audi Performance & Racing, LLC and demonstrates APR's continued commitment to lead the industry with the most technologically advanced products available.

Want chipped mode? Want to be able to switch back to your stock settings? Want a race mode to run 100 octane fuel at the track? How about a valet mode that limits power? EMCS is the lone technology on the market that can give you all of these options. No changing of the chip or ECU is required. These programs are available at the touch of a button.

APR has taken your cruise control buttons and utilized them for this function. Your cruise control will continue to function as normal, but will give you the ability to scroll through the programs you have purchased on your APR chipped ECU. The procedure is simple and involves only two steps.

Step 1: Press and hold the "set" button on your cruise control. After approximately five seconds, the "check engine" light on your dash will begin to blink once per second. This will tell you that you are activating program one. This blinking sequence will continue for approximately five seconds.

After this five second interval, the "check engine" light will begin blinking twice per second. This will indicate that you have activated the second program. This process is continued to access any remaining programs you may have purchased. (three blinks = program three, four blinks = program four).

Step 2: Once you have activated the desired program, simply release the "set" button. The "check engine" light will go off, and you will be locked in that program until you change it.

It's that simple.

APR's EMCS is a truly modular system that allows for future enhancements and features to be added as they are developed without the need for additional hardware. EMCS makes the following advanced features possible:

EMCS PRICING
All APR chips now include EMCS hardware. EMCS options are available at an additional cost over the normal price of a chip. Please remember that even if you do not purchase any of the following options, you will still be able upgrade to these options from most any internet accessible computer at a later date. Above the price of the chip for your car, the following options can be added to your ECU:

 APR ECU Modification Order Form(119K pdf)

A third option is to order a spare ECU and have us install the modified chip before sending it on to you. This will allow one to swap the stock engine computer back in when getting the car serviced. The spare ECU's that we sell are new factory units. Because of this, there are no refunds on spare ECU's, only on the APR software. For more information on this, see the Terms and Conditions of Sale. Spare 02+ A4 ECU's start at additional $500.