Last time we checked (as in a few minutes ago on the UK, US and German sites), the S5 Coupe continues to use Audi's venerable 4.2-liter V8 with 354HP, while the S5 Convertible comes with a 333HP 3.0-liter supercharged V6. Nevertheless, APS, the UK-based importer of the Swiss tuning brand Sportec, has released a performance upgrade for the S5 Coupe and Convertible with the... 3.0 TSI V6.
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