Various noises my car shouldn't be making

[matt5112]

When the engine is shut off there is a sound of escaping air from under the hood.

I'll try to locate it later on today but for now, any ideas?

Also, when applying the brakes rapidly a similar sound is heard.

This leads me to think somethings wrong with the brake booster.

I know all four brakes are working since I get piles of brake dust on all four wheels. Brake fluid reservoir is full and hasn't changed since I've bought it in the summer.

YouTube - Car noises

Video including my awesome exhaust note when letting off the gas rapidly.

[Thunderturd]

When you have a cone on your intake it will release back pressure and can be quite loud. Not sure about the brakes though...

[matt5112]

I've got a vid with every noise cept the brake pedal one. Uploading it as soon as its done rendering.

[matt5112]

Updated with video.

[nawarkk]

Yea when my engine is turned off, my filter sucks or pushes out air, It sounds pretty cool and I assume is normal.

[matt5112]

Sweet! Thats one down.

[Thunderturd]

I love that sound

[matt5112]

I find it hilarious that when I go to leave with a cold car, my entire family thinks my car is going to explode because of the cone intake noise.