QSD,
The noises you are hearing are normal. The FIPK replaced the stock intake tube which contains a silencer that eliminates all of the noises you are hearing.
You are hearing the turbo spool up when you press on the throttle. The "Pfffsst" sound is the surge valve (blow-off valve) venting the pressure from the turbo back into the FIPK prior to the turbo inlet whenever you close the throttle body butterfly. Chrysler engineered the recirculating surge valve (blow-off valve) to help the turbo stay spooled up. The Mopar blow-off valve conversion kit vents this pressure to the atmosphere (not the intake tube or, in your case, the FIPK) and you really hear the "Pffgsst" sound.
Scott
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