i got an 09 tc with 12k, i changed the oil and the air filter... now when i drive my stock intake howls and when i first rev it gives a mild breathe in type of sound and sounds deeper... have i done anything wrong.. i double checked everything

 

maybe sucking more air bc it is a cleaner filter. Do you drive your car off road?

 

never... there is alot of dust in the area though and we do live in a desert... not a complete desert but you know what i mean

 

Check to see that you have the vacuum line on. And maybe you might have left a gap when you were screwing it down.

 

post a video of the sound