Turbochargers spin at over 100,000 RPM. The sound pack must increase the frequency of the whine as the revs climb, not just loop a generic jet engine sound.
: That iconic "pssh" sound when you lift off the throttle. lfs turbo sound pack
Before you search for "LFS Turbo Sound Pack download," make sure you have: Turbochargers spin at over 100,000 RPM