"turbo whistle"

Don't worry be Happy.
The whole system needs checking out for leaks, just block the intake up and listen. O'h do it at idle of course.

gid'ay jeff
my thoughts exactly,i'll be looking for a suitable o ring to do the job.
regards toohey.

Doger, I am happy, I've got a Toyota! LMAO

But on a serious note what about bulldust getting past the filter etc. Sureley if it's leaking around where it clips together could'nt that potentially let dust though to the "clean" side of the filter?? I'm not sure exactly what this air box looks like though so I could be way off the mark.

But yeah an O ring sounds the go, is this "normal" on these vehicles? If so it may pay for others to check also before delving into the deep water...

I would have thought it should have had a gasket or some sort to none of the air bypassed filter ensuring dust etc was filtered out.