no load, no boost
Maybe that's why you think your not boostin, bcuz your not boostin
You been revving it at nuetral or park
That's why there's no no boost
If the gauge reads at -4 but not moving at all
Its a bad sending unit
If its broken the boost gauge will be at 0 constantly
The hissing sound can be a bov problem
Have you tried blowing on the bov
If you can blow on it freely, that's most likely where you're problem lies
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