I have a 34 also with silicone inlet etc, when planting it in 4th at low rpm i get a interesting noise as it comes up onto boost, but has zero impact on performance it seems and goes away once in the higher rpm ranges.

sounds like it might be surging? had it running for over 2 years, no issues though, and believe to be common. verso tune by sean.

stock ej205 block, cams, heads. maybe the heads aren't flowing enough for the motor to ingest the volume of air the turbz is pushing in at that lower rpm range?

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Should have bought an STI