Audi RS4 (2013) 4.2L V8 FSi – Developed 443 to 474 bhp with torque 317 to 339 Lbft.
Already quick, tuned from the factory and whilst there aren’t quite the gains seen in the turbo charged RS variants – Celtic Tuning are still pushing the very best from this engine (within safe limits – removing the 155 speed limiter also….).
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