i have a 2009 997 turbo with mostly every bolt on except turbos or headers... i have the cobb custom tune with miltek exhaust and 100 cell hjs cats...the shop was going to do a cat delete but decided to gut my cats instead ...at first the car was ok but then i have severe rattling and droning ... i dont enjoy driving my car like i used too... what are my options? can i re install high flow cats? do i need a whole new exhaust?

 

I'd expect you can buy cats and have them installed by a decent exhaust shop