'05 MC, 58K mi, manual. Get a rattle at about 3500 - 4000 rpm. Only when under load. Sounds like coming from just ahead of fire wall. Shop has determined that NOT exhaust system, nor body plate (Shop talk I did not understand?). Anybody have any ideas? Getting really frustrated. Bought it 24 days ago, only had it home 5 days because Honda Dealership can not correct the problem that was noted to be fixed as part of purchase.

 

I can get you the part number if somebody else can explain what a rattle shim is