Is this a normal sound?

[Stokholm]

All,

I am doing some troubleshooting on my 2001 Boxster S. The car fells a little slugish on the gas, especially in low rpm´s and I have also had a few engine lights pointing to O2 sensors. All O2 sensors are now new, all filters, air and oil have been replaced and today I cleaned the throttle body. It runs a little smoother but it still sounds like it is gasping a little for air when I push the throttle. Is this normal or do I have a vacum leak somewhere? I shot a video of the gasping sound:

https://www.youtube.com/watch?v=hywsIBly4Jk&feature=youtu.be