Should have nothing to do with your overall power.
If you have moosing bad, check that you have the most updated SVT Idle air control valve. There is a distinct difference between the SVT and non SVT IAC. The dealership accidently installed the stock non-SVT IAC on my car years ago and the moosing sound appeared. I figured out the problem and took it back to the dealer and they eventually put the right one on the car. Then the sound went away. With my Intercooler on I now sometimes get a little but ONLY when the outside air temp is very hot, and it soon goes away.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black