2.0tdi pd140 “choo” sound

[Wil1p]

Hi, I have a 2010 Seat Leon 2.0TDI PD140. Ever since I bought it, when letting off the accelerator the car choos.

had a backbox delete, and the sound obviously got louder. Does the sound through the Rev range and less at higher rpm.
I don’t want to get the car remapped if the turbo is broken...

just wondering if it’s normal and safe, or is it the turbo going.
The car’s at 66k miles and looked after.

 

[Ghostface]

Also known as Owling/Cooing, can be a few different things. Have a read here:

https://www.seatcupra.net/forums/threads/owl-noise-what-is-it.348527/

 

[t121anf]

Wastegate chatter,