Rattling Noise, Can anybody help me out. Options

[Stealths95GT]

So I purchased my Celica in March of '03. In April I started to hear this rattling noise when the vehical is reved. When I got to Washington state, I had exhaust put on and it covers it upa bit, but it's about time i fix it. Now, when i have the car is neutral and hits 4-5K on the tac, it rattles. put it in 1-4 gear and it doesn't rattle at all. but it does in 5th as well. I think it's a trans. problem but i don't wanna take it in to get it looked at when there is nothing wrong with it. if anybody knows for sure what it is or had this problem...let me know how ya fixed it...thanks again

~Stealth~

[Stealths95GT]

well i know it isn't my cai, cause it was happening before i had it installed...and i doubt it's the jack but i'll check...most reasonible answer is either the heat sheilds or trans....but when i find out what's wrong i'll post it so if anybody else gets this problem...it will be solved

Latazz