Performance wagons were born to devour Germany’s glorious Autobahn and the Audi RS4 Avant is a prime example of a mile cruncher. Its twin-turbo 2.9-liter V6 offers healthy power to effortlessly haul people and luggage at high speeds, but tuners have a soft spot for Ingolstadt’s fast wagons to unlock additional oomph. Case in point, HGP Turbo has created a stage 2 kit for the RS4 Avant built from 2019 with the gasoline particulate filter.
It costs €6,900 (about $7,600) and takes the standard output of 450 horsepower and 450 Newton-meters of torque to a meaty 615 hp and 819 Nm (604 lb-ft). The massive bump in output has shaved off a full second from the 0 to 62 mph (100 km/h) run, which now takes just 3.1 seconds. The 62-124 mph (100-200 km/h) task is achieved in about seven seconds and the car will do close to 205 mph (330 km/h).
It looks like they got rid of the soft rev limiter that kicks in when the automatic gearbox is in neutral as we can see the engine exceeding the 4,000 rpm mark, nearly reaching 6,000 rpm. The tuner’s website says the exhaust system benefits from modified flaps for a meaner soundtrack. As you probably know by now, the recent Audi Sport models sold in Europe have a rather watered-down exhaust noise because of the stricter emissions regulations.
Sure, it doesn’t sound as nice as the old 4.2-liter V8 the previous-gen model had, but the days when the RS4 Avant had the FSI naturally aspirated engine are never coming back. The advancements made in turbocharging have made acceleration impressively linear, mimicking a NA engine. Forced induction offers torque levels impossible to achieve with a naturally aspirated mill, especially in the low rpm range.
The adjacent video shot by MotorOli.de / YouTube shows the RS4 Avant modified by HGP Turbo continuing to pull strong even at speeds approaching 200 mph. It goes to show the engine’s potential and why tuners enjoy working on the V6 TFSI you’ll also find in the RS5 models, but also in the S6 and S7 sold outside of Europe.