I bought a used Txs Fmic & under full throttle it makes a noise similar to the sound of holding a blade of grass between the 4 knuckels of your 2 thumbs and blowing. Its a lower pitch than the turbo spool, and doesnt change pitch with rpm's like the turbo. I removed the filter from my sri and the noise is still there. I noticed the passenger side port on the IC core wasn't completely round, more of a reverse D shape with the flat spot on the outside, probably bent in shipping. Kinda has a duck call sound to it under boost, along side the usual turbo/intake sound. I plan on addressing the D shaped port soon noise or not, but is there anything else I should look for? Other under hood mods are CPE SRI, Cobb inlet, & a Forge BPV.