... the catalytic converters' heat shields.
There is one shield over each cat.
The shields are held in place by quarter-turn fasteners that tend to rust and get loose or lost.
If one or more of the fasteners is loose the whole heat shield will rattle.
The fasteners are only sold by the dealer but they are not too expensive.
If you find that that is the problem, replace them all, otherwise you will be fixing it again soon.
Happy Boxstering
Pedro
Pedro Bonilla1998 Boxster 986 - 311,000+ miles:
[www.PedrosGarage.com]
PCA National Club Racing Scrutineer - PCA National HPDE Instructor - PCA Technical Committee (Boxster/Cayman)
Racecar spelled backwards is Racecar
"Racing is life. Anything before or after is just waiting" ... Steve McQueen as Michael Delaney in "LeMans"
"If you wait, all that happens is that you get older"... Mario Andretti
"Being second is to be the first of the ones who lose" ... Ayrton Senna