Audi S5 Tuning Catalog for Performance EnhancementsTuning Solutions for the 2008 Audi S5 4.2 V8 CAUA Engine:

4.2 V8 CAUA Stage 1

Audi S5 4.2L V8 (EA824)

The naturally aspirated 4.2L V8 found in the Audi S5 is one of Audi’s most iconic engines — offering a balance of smooth, high-revving performance and robust power delivery. Our TuneZilla Stage 1 ECU calibration enhances throttle response, optimizes ignition and fuel mapping, and refines torque management to unlock additional horsepower and drivability, all while maintaining OEM-level reliability and smoothness.

Stage 1 Tune

Description:
Stage 1 is designed for vehicles running stock hardware and 93 octane fuel. Through precise recalibration of the factory ECU, we’ve improved throttle response and torque delivery across the entire RPM range. This results in a sharper, more responsive drive and a noticeable increase in midrange performance.

Requires

Horsepower: 375 HP
Torque: 442 TQ
Fuel: 93 Octane
Hardware Required: None (Stock Hardware OK)
TCU Tune: Optional
Flash Method: Bench Flash Required (Dealer Flash or ECU Ship-In)

Notes

⚠️ Note: proper supporting upgrades and regular maintenance are strongly recommended.

This ECU must be bench-flashed.
You may ship your ECU to TuneZilla or visit an authorized dealer for installation.