The last couple of months I have had a burning smell coming from my engine only when I go to about 7k RPM. Seems like anytime I push it a little bit it will start to give me that smell. My friends have noticed it too while driving with me or behind me. Does anyone know what this could be?

Im still under warranty but i obviously hope its not serious.
I have the 2006 Si
UPDATE!!!!!!
So today I turned my car on to go to over a friends and i pull out of the driveway and NO POWER i got hardly any power, had to rev it to about 6k rpm to get anywhere at all. So im having it towed to Honda tomorrow and ill give you guys another update after they tell me what is wrong with it. It sounds as if two belts are rubbing together or oil is burning.
I am so upset right now you have no idea, im so worried about what could be wrong with it.
ANOTHER UPDATE!!!!!!!
It was my clutch but and Honda wanted to charge me 1700bux to replace it but i called honda and they did it for me for free! woot!