Rear Top Mount Isolator Bush PFR57-830 Audi > A3 > (8P) 2004-2013 > 3.2 Chemical composition and mechanical properties

Chemical composition and mechanical properties are those associated with 6063/H9 Aluminium Alloy

unused fuel vapours and moisture

which essentially bottle-necks the inlet tract to the throttle body

or you can blank them all off

Rear Top Mount Isolator Bush PFR57-830 Audi > A3 > (8P) 2004-2013 > 3.2 Chemical composition and mechanical propertiesRear Top Mount Isolator Bush PFR57 830 PFR57 830 Rear Top Mount Isolator Bush is a direct replacement for the OE foam isolator, meaning that you no longer have to buy an expensive complete mount and can just replace the problematic part. It offers increased durability and performance while providing a cost effective, fit and forget solution that's a worthwhile upgrade as part of any rear suspension overhaul. OEM Part Number: 997 333 061 00 997 333 061