Audi has released all-new sports versions of its cars in the US recently, including the RS Q8, RS7 Sportback, and the long-awaited Audi RS6 Avant. A 2020 RS4 Avant is due for a comeback in Europe, but as we're already getting the Audi RS6, the chances of us seeing a return of the smaller long roof model are, well, small. However, if you want one right now in the US, someone has gone to the trouble of converting a 2018 Audi A4 Allroad using factory S4 components.

The build is comprehensive, down to using turbocharged 3.0-liter V6, a quilted Magma Red leather interior, and a factory digital instrument cluster. It's also now up for sale via Bring A Trailer.

The conversion was performed by Pacific German in Laguna Hills, California, using two new cars bought specifically for the project. On top of the engine, other chassis modifications include a Brembo big brake kit with 6-piston calipers for the front, 20-inch Rotiform wheels, and 034 Motorsport suspension with KW Variant 3 coilovers. Along with the red leather interior, the converted S4 Avant also boasts black suede on the headliner and A, B, C, and D pillars. Smaller details include an RS4 shift knob and door pull handles from the European market, a factory Audi S4 pedal set, factory carbon-fiber trim, and factory red-stitched S4 floor mats.

The conversion even includes an RS4 Exclusive multifunction steering wheel as well as the turbocharged 3.0-liter V6 from the donor S4 vehicle along with an ABT Power Module, CTS turbo intake system, and a Milltek cat-back exhaust system.

It's about the most comprehensive conversion you'll find, despite the S4 quad valance not fitting the Allroad bumper. The seller claims he has been using it as a daily driver, which should mean it's reliable. As for whether it is worth the $55,000 it has reached with five days of bidding to go (as of writing) is another matter.