Strange noise when revving car

[182tev]

When I rev the car up, at about 4k rpm it has a strange resonating noise from the front of the exhaust.

Not a rattle or anything, just like the sound of the exhaust is resonated onto something which makes the car sound crap from the front end.

I really car figure it out, maybe its just a heatshield or something.

Just wanted to see if anyone has had the same issue. ??

Also if the exhaust has a small blow somewhere, will it affect performance ??

 

[tom172cup]

Heat shield would be my guess. and exhaust blow will lose you minimal performance

 

[182tev]

So a very small exhaust blow isnt much to worry about.

 

[MartinR]

Cat to manifold kit could be knackerd