Audi A5 hissing exhaust

[gordie_20]

Hi there, I have had the two back boxes deleted on my A5 3.0 V6 TDI. There is a loud hissing now from the exhaust when idling and then all of a sudden it can get louder. It is a bit like a hair dryer noise! Sounds great when I put my toe down though! Any ideas what this could be please?

Thanks.

[Trevor]

Hi Gordon....welcome to the Forum!

It sounds like there is an exhaust leak, especially as the system has been altered recently....check by getting a friend/wife/neighbour to put a rag over tailpipe(s) to seal the exhaust and you'll be able to hear where it is escaping from.

Alternatively, it could be a split in one of the intercooler hoses that's making the noise.

Let us know how you get on with it

Cheers   Trevor