World Car Fans publishes some spy-shots of an Audi A4 being tested in the snows of northern Sweden. If the quadruple exhaus tubes and the big alloy rims don’t lie, it should be the new Audi S4, which should be coming out later this year.

The biggest unkown of the new S4 is the engine: will it be the same 4.2 litre V8 FSI of the S5, with 354 ps ? Or will it get un upgraded version of this same V8, with up to 390 ps ? Or, again, it could get the new V6 3.0 Turbo-FSI that everyone expects to come out soon, which should output 333 ps.

We believe that the S4 will get an upgrade to the V8 of its sister, the S5, only if the 3.0 V6 TFSI will be mounted on a “normal” A4, in which case a power-step up to 390 ps will be needed. The same goes for the next RS4 which, in this case, will probably get an upgraded engine with about 500 ps.

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