Listening to that second vid at the engine bay it does sound as though there is an unusual amount of intake noise, but that could just be your recording.
Providing the exhaust is not blowing anywhere - particularly at the flexi joints, (which you will find out on Monday) I wonder if one of those large puddles you drove through has got into the intake and/or it is now not 'baffling' the intake as it should? Unlikely, particuarly if you have the standard intake as shown in your link thread but I'm clutching a bit at straws to try to help you:
Not much help, but maybe a couple of things to check first