The first few months of FI you'll hear this "surge" quite a bit, but only at very low boost. It has diminished a bit since then. I talked to Sam about it as well, and he told me it's normal.
Wait until you kick up the boost... then the BOVs will really start to make some noise. It's music to my ears haha.
BTW, I still have the Southbend clutch, but Joe provided me with a full face ceramic disk to replace the DXD street disk. The new HD-CSC has a different bearing on it as well. After finally giving it a proper bleed, everything feels great now.
__________________
|