Dturbo wooshing/turbo sound

[Tom]

I seen a dturbo the other night R reg diablo in st austell maccies if it was anyone on here.. But he over took me a treat on the bypass i seen him coming dropped to third and booted it and he just went passed as if i wasnt moving it was nuts.. Then when i seen him in the car park he booted it past me and his car made like this wooshing sucking sound and it sounded amazing and i wanted to know what it was so does anyone know? It was really loud aswell i couldnt tell it was a diesel when he opened it up:/