today i was driving around with top down and had the radio on and noticed this new chatter sound. its an 01 with 60k. i didnt notice unti l i put it on mute. it is my dd and have never heard his sound before. i came home parked and put the top up and windows up and now i can def hear it. it doesnt really sound like anything coming from the engine with the hood up. but inside the car its a like a weird but very noticeable chatter sound. it gets louder as u hit the gas but not from the outside. when i move the throttle on the engine it sounds fine. i sit in the car i get this bad like clack/chadder sound. my mods are intake catback and testpipe. i need help asap

 

ha got it! oil cap came off some how. im thinking its on top of the trans rattling. i was hittin alot of vtc today lol