What can cause an exhaust to rasp..

[r8byb]

Hey guys, firstly none of my setup has changed other than a new baffle in one tailpipe due to the other coming loose..

Basically now my exhaust has a rasp, cant really hear it outside as my mate drove it and it sounds nice, but inside its annoying me.

I might be being picky, infact i know i am, but just wandering what it could be

Cheers

PS there are no blows

 

[cat171]

Small hole in it near the back box imo.

 

[Fletcher]

Like cat said, it sounds like a little hole.