I'm hearing a consistent rattle / buzz noise when depressing clutch to upshift at medium to high RPMs. The noise "seems" to emanate from the lower dash/footwell area, but noises are sometimes tricky. This does not occur when decelerating and downshifting.
Given past experience with this type of sound, I put the WRX (02 with about 75k miles) up on ramps and checked out the exhaust + heat shields, but didn't find any obvious rattles. I also had a cat break up on me in another car that made some goofy buzzing noises, but this usually happened on deceleration which is not the case here with the WRX.
Any experience or suggestions for this problem?