Wow !! 2018 Audi RS4 Avant Review 2018 Audi RS4 Sedan Review When we first drove the latest Audi S4, which is powered by a turbocharged 3.0-liter V-6, we were a bit underwhelmed: Itâ€™s a bit less responsive and less exciting than the previous model. There clearly remained space for a meaner beast at the top of the lineup. Now, at the Frankfurt auto show, that car has arrived in the form of the all-new 2018 Audi RS4 Avant price, a vehicle that always sets our hearts to racingâ€”even though there are no current plans to offer it in the United States. 2018 Audi RS4 Avant specs and release date is mechanically similar to the RS5, with those two sharing many componentsâ€”most notably the awesome 450-hp 2.9-liter V-6, which is a twin-turbocharged variation of the S4 sedanâ€™s single-turbo 3.0-liter engine. This powerplant springs from an engine-development partnership with Porsche in which Audi handles the V-6s and Porsche the V-8s. You can also find it installed in the Porsche Panamera S and the upcoming next-gen Cayenne S. As for aural output, the twin-turbo V-6 will be no match for the RS4â€™s previous naturally aspirated V-8, but at least the cabin can be filled with sporty noises, depending on the driving mode selected. Zero to 62 mph takes a mere 4.1 seconds, Audi says, while top speed is governed at 155 mph, or 174 mph if youâ€™re willing to cough up a bit of extra dough.