Audi 8Y RS 3 Quattro 2.5T Performance ECU & TCU Tuning

End User Flashing allows Dynamic+ Performance Software customers to receive and install software updates and revisions, flash back to stock, or upgrade to the next stage of performance software for their vehicle. The 034SPI Mobile App is only available on vehicles with Dynamic+ Tuning installed. You must purchase Dynamic+ Tuning for your Audi or Volkswagen to access the Dynamic+ Flashing Suite and 034SPI Mobile Application.

Brand:

ES#:

4684889

Mfg#:

034-103-3306

EO#:

D-850

Unlock the full potential of your 8Y RS3 with Unitronic’s cutting-edge performance software!

Brand:

ES#:

4920408

Mfg#:

8YRS3ECUNEW

Starting at $2300.01 USD

Customize

Free Shipping

Partial Replacement

Bring your new car to life with more power and torque.

Brand:

ES#:

4714981

Mfg#:

VWR030001-RS38Y

$980.99 USD

Add to Cart

Free Shipping

on orders $49 and up

Lifetime Replacement

Unlock the full potential of your 8Y RS3 with Unitronic’s cutting-edge performance software!

Brand:

ES#:

5425911

Mfg#:

8YRS3TCUNEW

Starting at $0.01 USD

Customize

Partial Replacement

Bring your new car to life with more power and torque.

Brand:

ES#:

4765816

Mfg#:

VWR030001-RS3OPF

$980.99 USD

Add to Cart

Free Shipping

on orders $49 and up

Lifetime Replacement

Features CAN-Bus connectivity for more advanced tuning — gain up to 50whp/65lb-ft on a stock car Not for sale or use in the state of California.

Brand:

ES#:

4213373

Mfg#:

JB4-BETA-8V2RSKT

$758.00 USD

Add to Cart

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Lifetime Replacement

Features CAN-Bus connectivity for more advanced tuning — gain up to 100WHP/100WTQ on a stock car

Brand:

ES#:

4785762

Mfg#:

JB4-GP9-8YRS3SEN

$599.00 USD

Add to Cart

Free Shipping

Lifetime Replacement

Features CAN-Bus connectivity for more advanced tuning — gain up to 100WHP/100WTQ on a stock car

Brand:

ES#:

5396286

Mfg#:

JB4-GP9-8Y25PSEN

Enhance your tune with true on-the-fly adjustability—directly from your smartphone.

Brand:

ES#:

5424774

Mfg#:

UH025-ACA

$99.00 USD

Add to Cart

Free Shipping

on orders $49 and up

Lifetime Replacement

Proprietary tune box designed specifically for the EA855e DXHA 2.5L TFSI with gains of +50 Horsepower / 40 ft-lb of Torque! 2X Entries For Our 25th Anniversary Sweepstakes!

Brand:

ES#:

4906475

Mfg#:

64.02.08

5% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$649.00

This product was last offered at the strikethrough price on
08-12-2026

$616.99 USD

Add to Cart

Free Shipping

Lifetime Replacement

Version 1.

Brand:

ES#:

4940110

Mfg#:

JB4-OBDII-4P7FCA

$25.00 USD

Add to Cart

Free Shipping

on orders $49 and up

Lifetime Replacement

Replacement JB4 OBDII cable suitable for use in all applications where the JB4 attaches to the OBDII port under the dash.

Brand:

ES#:

4714891

Mfg#:

JB4-OBDII-CA

$25.00 USD

Add to Cart

Free Shipping

on orders $49 and up

Lifetime Replacement

Get access to even more vehicle data using PROLINK+ to wire in up to 2x analog signals and 1x CAN bus signal. Compatible with MPVI2+ and MPVI3 interfaces. For use with HP Tuners MPVI2+ and MPVI3 interfaces only.

Brand:

ES#:

4840618

Mfg#:

H021-002-06

$60.99

This product was last offered at the strikethrough price on
05-12-2026

$49.99 USD

Add to Cart

Free Shipping

on orders $49 and up

Lifetime Replacement

Replacement JB4 OBDII cable suitable for use in all applications where the JB4 attaches to the OBDII port under the dash. Includes JB4 side repair harness molex pigtail.

Brand:

ES#:

4714892

Mfg#:

JB4-OBDII-CA-MC

$30.00 USD

Add to Cart

Lifetime Replacement