in the video your gonna hear a airy noise at the end i have a stage 3 all weistec cpc,ecu downpipes and turbos and bms cold air intakes. does anyone have a clue what that noise is

Sounds like letting off the throttle in a turbo car with air intakes that are not enclosed.

i checked the cold air intakes and they are really tight i don’t know what else it could be

You are missing the import of my post. As a result of you running BMS intakes (which do not have an enclosed air filter), your car sounds normal for a turbo vehicle.