Identify this sound

[tlsnokuyeulb]

This just started yesterday. It only does it around 2500rpm and only at half or more throttle. It is quiet with anything less than half throttle. I'm hoping its a heat shield or something like that. I haven't had a chance to get in there and look. Plus I can't replicate the sound unless the engine is under load. What do you all think?

http://youtu.be/XinBysU92p8

Thanks. I tried to get a good audio sample but it is my phone. If I don't get a chance to thoroughly inspect i'll set up a mic in the car. Thanks.

 

[tlsnokuyeulb]

I should add that this was after I added my Airaid. It's annoying. I checked everything I could and nothing seems out of the ordinary.

 

[KMeloney]

Not sure from the sound clip which sound you're asking about. Can you better describe the problematic sound? Thanks.