Bad rattling noise please help

[vietman]

For about three weeks I've been hearing a rattling sound coming from under the car when the rpm us above three thousand five hundred i jacked up the car because people on here told me if I have a bigger down pipe that could be it but it wasn't it seems to be the drive shaft wondering if anybody has had a similar problem and also is the drive shaft suppose to move around or its suppose to be stiff

[ultraflip]

Could be a a lot of things...

Most common is downpipe against shit around there...
Or the heat shield over the cat area rattling against the exhaust

[vietman]

I checked both of those and nothing is the cause of the rattle I put the car on a lift and had a guy rev to three and half and my dad checked the exhaust dp car and heat shield and nothing but when he held the drive shaft the rattling went away

[Azian]

what exhaust do you have ?

[vietman]

I have the rre exhaust and rnr (if I remember correctly) high flow and an invidia dp

[vietman]

When I first put the exhaust it rattled but towards the back of the car but I fixed that and now its coming from under where I sit

[vietman]

Took the car in and this is the sound of a tc going out =( but its covered under warrenty =D