wierd rattle

[mitsutunerwh]

I have a pretty simple problem but its bugging me. very time i get to about 2500 or 3000 rpms i get a higher pitch rattle coming from the bottim rear of the car. It sounds in the best way like tin rattling against other mtel slightly.
Help I have a rear mounted battery could that be it?? I have checed the struts and the mounting.

Any options would help!!

 

[Defiant]

Check over the heat shields on the exhaust system.

 

[1990CherryTSI]

Because I have the same problem. It's coming from the front of the car, the front left side. It is metal on metal, at first we thought exhaust but I took off the exhaust after the downpipe, at least now it puts out 14 lbs of boos vs 9 with the exhaust on Just goes to show how important that mod alone is , also um, someone suggested the crankshaft pulleys are hitting against one another? It is metal against metal, only under load, not at idle, not in neutral revving, and mainly under heavier load. If you are going 60, and just cruising, no noise, you get on it, it starts up. Same as yours?