My first noise

[bst82551]

Hey guys. I finally drove my Yaris hard enough to produce some sort of unpleasant noise. It sounds like it's coming from the belt/pulley (passenger side) of the engine. It may even be inside of the engine itself (maybe loose valves or failing timing chain). I just thought I'd throw a video up of the noise to see if anyone recognizes it or could diagnose it by just a sound a brief description. Here is the video I've made of it:

http://www.youtube.com/watch?v=DDLQc7EFa7g


-Brian

Additional info:
* not throwing any codes (I checked with my scangauge)
* 75k miles, mainly highway miles
* automatic tranny
* I drive it pretty hard
* Only maintenance done has been oil changes, tires, and air filters
* Mods: groundwire kit, K&N air filter & modded intake box (drilled holes in it and removed silencer tube), rear sway bar