Hey guys having a similar problem in my STOCK My99 WRX, thought i'd bump this thread as its relevant.

I AM getting quite a pronounced rattle when decelerating in the 2-3k rev range.
I have checked all heat shields that i am aware of, turbo exhaust shield, and pretty much all of the main exhaust shields, and they seem fine, quite stiff and not budging at all.

I really hope that this is not a big end bearing failure, as i am flat broke at the moment having not been able to work after getting stress fracture to the foot (doh!).

Is there anyone on the forums who could have a listen and tell me the bad news?

I'm hoping it is just the uppipe, cant seem to isolate the noise, as i can only hear it when driving, doesnt occur when revving out of gear even when up to 4k rpm.

cheers