I guess the previous owner put a clutchmaster stage three cluch in. Not sure how recent. When I nail it the car will rattle from the engine bay/tranny area. Its loud enough so that you can hear it clearly over the engine/exhaust.

 

if its pretty well recent it might clear out, im not sure what going on with yours. We put a clutch in my friend's 7 and it raddled so hard it shook the entire car when we first started it, but it cleard out over like 50 miles of drving.

 

my car did the same thing it would rattle at idle and even alittle more when revved.when my motor blew replace the motor and pilot bearing and rattling was gone. maybe he didnt replace the pilot bearing its recommended that you replace it when taking the tranny off.

 

So you think it could be the pilot bearing?

 

the wierdest thing mine does two and i installed a new pilot bearing, rear tranny seal, Mazdaspeed clutch on a street strip RB clutchplate....s4 tranny and its not loud for me its more when i depress the clutch and drive slow...no sideffects thus far though...

 

im pretty sure.when i pulled out my motor i used the same clutch and the same components the only thing i change was the pilot bearing when i got my new motor in and put some grease in there and drop the motor in and cranked it and notice that i didnt hear it anymore.but you never know.