Little engine back story first. Bought a fairly modded '04 WRX Impreza with an EJ257 swap, 2.0 heads, and then added a few mods myself (AOS, Inlet Hose, TGV Deletes, and an Intake Manifold).
So I'm driving down my local hwy in 5th cruising, throw it into N to coast onto the off ramp, and I hear...