Your Vehicle
Audi RS4 4.2 FSI V8 420hp
Technical Specifications
Power and torque increase
Stage 1: software remap only, no mechanical changes, fully reversible. Stage 2: remap combined with downpipe / sports air filter.
Stage 1: file 100 € online + installation 350 € at the workshop (via the OBD port) Book now Stage 2: quoted on request Ask for a quote
Power HP
Torque Nm
Buy the Stage 1 file, pay the installation at the workshop
100 € VAT included: the file developed for your engine, paid online
Installation: 350 € network price, the workshop may charge less, paid at the chosen workshop (via the OBD port) · terms
Power Graph · Stage 1
Audi RS4 4.2 FSI V8 420hp: da 420 a 440HP
Values for Stage 1 (change the stage from the control above)
Remapping Audi RS4
MasterTuning develops remapping for Audi. La Audi RS4 4.2 FSI V8 420hp può passare da 420 HP a 440 HP con un incremento di 20 HP.
The development of each remap is customized by MasterTuning.
- 100% customised files with lifetime warranty
- Reference values for Stage 1: the file is developed on your vehicle and checked in the workshop
- Best performance, within safety margins
- Reduced fuel consumption
ECU Remapping Details Audi RS4 4.2 FSI V8 420hp
The Audi RS4 4.2 FSI V8 420hp is equipped with a petrol engine that produces 420 HP and 430 Nm of torque in its factory configuration. With MasterTuning's professional ECU remapping, this Audi can achieve 440 HP (+5%) and 455 Nm (+6%).
Our Stage 1 tuning for the RS4 B7 - 2004 - 2008 delivers an impressive gain of +20 HP and +25 Nm, optimizing the petrol engine's performance while maintaining reliability and staying within safe parameters.
The engine code BNS identifies this specific powerplant configuration. The Bosch MED9 ECU is professionally recalibrated to unlock hidden potential while preserving engine longevity.
With 420 HP from factory, this Audi RS4 is already a performance vehicle. Our remapping extracts even more potential, delivering exhilarating acceleration and enhanced driving dynamics for enthusiasts who demand the best.
Technical Specifications — Audi RS4 4.2 FSI V8 420hp
Factory technical data for the Audi RS4 4.2 FSI V8 420hp (B7 - 2004 - 2008), used by MasterTuning engineers to develop a remap tailored to this specific powerplant. Figures shown are reference values for Stage 1; the file is developed on your vehicle and checked in the workshop.
| Engine code | BNS |
|---|---|
| ECU / Control unit | Bosch MED9 |
| Fuel | Petrol |
| Compression ratio | 12.5 |
| Bore × stroke | 84.5 X 92.8 mm |
| Stock power | 420 HP · 430 Nm |
| Remapped power (Stage 1) | 440 HP (+20) · 455 Nm (+25) |
Don't want to touch the ECU?
Rapid Dimsport add-on modules connect to the engine sensors with original connectors: they fit in a few hours and come off without a trace, leaving the factory software untouched. Useful on a leased car, one still under warranty or one you plan to sell soon. Check which ones fit your Audi RS4.
Frequently Asked Questions - Audi RS4
How much power can I gain from remapping my Audi RS4?
With MasterTuning Stage 1, your Audi RS4 4.2 FSI V8 420hp can gain +20 HP (from 420 to 440 HP) and +25 Nm of torque. This represents a 5% increase in power.
Is ECU remapping safe for the Audi RS4 engine?
Yes, MasterTuning's remapping for the Audi RS4 4.2 FSI V8 420hp is developed within safe parameters. Each file is developed on your vehicle, checked in the workshop and stays within the mechanical limits of the BNS engine.
Is the Audi ECU remapping reversible?
Absolutely. The original factory calibration of your Audi RS4 is always backed up before remapping. The process is 100% reversible at any time.
Will remapping affect my Audi warranty?
ECU remapping may affect your manufacturer warranty. We recommend checking your specific warranty terms. Many of our customers choose to remap after the warranty period or accept this trade-off for the significant performance gains.
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Book your remap or ask for a quote
Stage 1 can be bought online and is done at the workshop you choose; for Stage 2 we send you a quote.
Stage 2 is quoted on request: write to us and we will reply with price and timing.
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