Yesterday I did a bit of modding/tinkering.
A few days ago I swapped my IC hose from stock to a Samco, car felt like it had more grunt, no strange noises. Drove around with that for a couple of days. Then yesterday I wrapped a short peice of the top of my down pipe, about 7in, using some leftover wrap from doing my uppipe. I also put the stock IC hose back on so I could get some measurements on the Samco, got an IC swap planned.
After wrapping the downpipe and swapping the IC hose I drove for it 20min out and 20 back. I heard some type of higher pitched whine/whistle. It was audible when spooling from vaccum to a few pounds of boost, didn't get over 5psi on trip. It stuttered when the BPV vented. It sounds to me like my turbo might be on its way out. I rebuilt it with quality parts about 10k ago. It has been running good and strong until the other day.
I thought it might have been the stock IC hose, it has a small bend/rip at the compressor connection so I put the samco back on. Still got noise, little quieter though.
I did check all the vaccum lines around the turbo, nothing loose or cut.
I haven't checked the gaskets on the IC (hose elbows or BPV), they did look good when putting the samco back on. And I did tighten all the bolts on the IC to good-n-tight spec.
Anyone got any ideas on troubleshooting this noise?