bought a 3 door 2011 fiesta,they changed the back box before i bought it as it was gone but now its ridiculously loud. it was fine on test drive before they changed it?

Did they fit a standard box or performance one?

If it's a standard box they might not have sealed the joint properly

with engine running hold large screwed up rag over end of exhaust and see if it leaks somewhere else, easier if you have one person holding rag and another looking for leak.

6 hours ago, robbyvrs said:

Did they fit a standard box or performance one?

If it's a standard box they might not have sealed the joint properly

its only a bog standard one. mk7 1.25 on the motorway its unbearable 😕

3 hours ago, isetta said:

with engine running hold large screwed up rag over end of exhaust and see if it leaks somewhere else, easier if you have one person holding rag and another looking for leak.

i can't get under the car, it's got 3 months warranty so i'll run it back to them see what they say

17 hours ago, kevb123 said:

its only a bog standard one. mk7 1.25 on the motorway its unbearable 😕

Sounds like they didn't seal the joint with exhaust paste or tightened the clamp properly