Okay, that's a wee bit of a stretch. Doing that would require a costly engine-swap, replacing the S5 cabrio's 333-horse/325-lb-ft supercharged 3.0-liter V-6 with the coupe's high-revving 450-horse/317-lb-ft 4.2-liter V-8. This would also risk adding even more weight to the nose of the already hefty cabriolet. Instead, MTM offers a tuning package that boosts the V-6's output to 425 horsepower and 380 pound-feet and fortifies the brakes and footwear as well. And at least you get the RS 5's seven-speed twin-clutch transmission, which can't be had with the V-8 S5 coupe.
This dramatic increase of 92 horses and 55 lb-ft is attributed primarily to MTM's M-Cantronic engine controller. We reflexively throw the BS flag when tuners try to attribute that sort of power boost to chipping a naturally aspirated engine, but factory tuning of turbo- and supercharged engines generally leaves considerable power "on the table" in the name of sometimes quite conservative component reliability safety factors (hence most factory warranties are voided when the ECUs have been tampered with).
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