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Walbro 255, removing the gascap, there usually is a pshhh sound yes, Fuel pump sounds normal, Manifold to turbo, s15 gasket, studs, nuts tack wleded, with locking tabs ahaha(I had problems previously with that).
I did have an exhaust leak where the DP meets the Cat when I was on the dyno.
When we upped the fuel pressure to 85psi, when building boost it showed rich about 10afr, then as started to climb to about 15afr at 5500rpms. I know an exhaust leak would show lean, but I wouldn't think it would get worse exponentially(ish) like that(especially starting off rich).
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