B9 A4 APR Stage 1 Compressor Surge

2018 Audi A4 Sport Pkg. APR Stage 1 w Luft Technik CAI. The first part of the video shows compressor surge after letting off throttle under low boost. The sound is very cool, IMO, combined with the diverter valve sound. The latter two clips show the compressor surge while the car is under boost at medium throttle input. Around 2500 to 3000rpm you’ll hear the surge. One clip is on the freeway the other is on a back road.