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Audi RS4 RS4 4.2 V8

Name: Audi RS4 RS4 4.2 V8 chip tuning
Brand: Audi
Price: 95.00 EUR
Availability: InStock

B7 (2004–2008) · 420 hp

Stage 1

E85

E85 + Stage 1

	Original	After tuning	Diff
Power hp	420	440	+20
Torque Nm	430	455	+25

Power gain

+5%

Torque gain

+6%

Ready to feel these +20 hp on the road?

Get your ready-to-flash Stage 1 file for the Audi RS4

Order tuning file →

Stage 1 file: €95

✓ Original file back-up ✓ Delivered in ~30 min ✓ Support included

Power graph / Stage 1

PowerTorqueStock

	Original	After E85	Diff
Power hp	420	435	+15
Torque Nm	430	445	+15

E85 adaptation (no Stage 1)

Just the fuel switch: the ECU is adapted to run Superéthanol E85 (up to 85% bio-ethanol) with no Stage 1 chip on top. You get a small power bump from ethanol's higher octane (~104 RON) and a much cheaper fill-up. Flex Fuel file: the car still runs on regular petrol whenever you want.

Save €2 878 a year at the pump

Get your E85 adaptation file for the Audi RS4

Order tuning file →

File from €100

✓ Original file back-up ✓ Delivered in ~30 min ✓ Support included

Fuel cost — E85 vs petrol −47%

Petrol · 100 km

~~19.6 L~~ · €41.12

E85 · 100 km

24.2 L · €21.94

You save ≈ €19.19 every 100 km — about €2 878 a year (over 15 000 km)

E85 uses ≈ +24% more litres, but the pump price (€0.906/L vs €2.098/L, France average on November 3, 2026) more than makes up for it.

🇫🇷 Version française : conversion éthanol E85 de la Audi RS4, calculateur d'économies par département →

	Original	After E85 + Stage 1	Diff
Power hp	420	465	+45
Torque Nm	430	485	+55

E85 + Stage 1 remap

Chip tuning re-optimised for Superéthanol E85: the ignition and boost maps are calibrated to make full use of ethanol's higher octane (~104 RON). Bigger power and torque gains than either Stage 1 on petrol or E85 adaptation alone, plus the same cheap fill-up.

+45 hp and €2 878/year saved — both

Get your E85 + Stage 1 file for the Audi RS4

Order tuning file →

File from €100

✓ Original file back-up ✓ Delivered in ~30 min ✓ Support included

Fuel cost — E85 vs petrol −47%

Petrol · 100 km

~~19.6 L~~ · €41.12

E85 · 100 km

24.2 L · €21.94

You save ≈ €19.19 every 100 km — about €2 878 a year (over 15 000 km)

E85 uses ≈ +24% more litres, but the pump price (€0.906/L vs €2.098/L, France average on November 3, 2026) more than makes up for it.

🇫🇷 Version française : conversion éthanol E85 de la Audi RS4, calculateur d'économies par département →

Original ECU files for Audi RS4 Stock (ORI) files of this model · €20 per file →