hey thanks for looking guys

okay here is my problem. I noticed that I am hearing rattling sound from underneath the car. I am not sure where it is coming from. It sounds like rattling of losen bolt, but it only happens when i am steping on the gas. (when i am going uphil, in 3rd gear at bout 3000rpm, and when i hit up to red line, it happens 4~rpm or so)

what can it be?

 

perhaps your heat shield is loose

 

I had a heat shield problem and when I step on the gas it went away check the exhaust springs cuz thats whats rattling on mine