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The B5 S4 2.7T biturbo (APB, BEL), the same engine as the C5 A6 and allroad 2.7T, is tuned by turbo: stock K03s or upgraded turbos.
| Turbos | What you get | Tune |
|---|---|---|
| Stock K03s | Stage 1: 320 hp and 350 lb-ft with no parts. Stage 2: 330 hp and 375 lb-ft with downpipes. | Stage 1 and 2 tune |
| K04 or K04 hybrid; big turbo or single turbo | Custom, built for your turbo | Stage 3 and 4 tune |
The Tiptronic automatic has its own Tiptronic TCU tune, written to run with a GTS Stage 1.
Audi B5 S4 / C5 A6 2.7T Stage 1/2 Tune (APB/BEL)
USD $299.99
Audi Tiptronic TCU Tune (B5/B6/C5)
USD $400.00
Audi B5 S4 / C5 A6 2.7T Stage 3/4 Tune [K04/BT] (APB/BEL)
USD $599.99
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