MAP Sensor Hiss
 

I have one simple question that I can't seem to find any results on in a search. I installed an MS3 DIY kit and have the car up and running. My BMW TPS seems to have a bit of noise in it so I pulled the carpet up to get the ECU back out and ran a dedicated ground to see if it would help. Anyway With the ECU back out in the open I noticed I can here a faint sound like a vacuum leak hissing inside the ECU.

I have the MAPdaddy upgrade. Should the map sensor be making a slight hiss like that or should it be completely silent? The car is running fine and idles well so curious if it needs to be fixed or not.

Thanks.