OP
The Corsa and SW ZL1 exhaust systems (I have the SW system) will fit but you will not only need a ZL1 diffuser but an absorber as well (2012 SS use the same absorber as the ZL1). Heat shields are not required but are highly recommended. You can buy the entire kit from Roger's Chevy. They are a sponsor for this site and Mareen is totally awesome. She shipped my complete diffuser kit to me for free (shipping) and in three days....
Look at the DIY section for installation. There are several methods people have used for an SS..
...and you will love the sound it makes when you are finished...
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