Exhaust issue

[Aaron Dobkowski]

Hey guys.
I've had a 2.5" Catback exhaust with a set of J-pipes fitted to my ve ssz ute and pretty happy with the sound and idle. Only issue I have is an annoying whistle noise when under a heavy load and the revs are high.
Any ideas on how this can be fixed?

 

[blackve76]

Sounds like a leak somewhere