The "Touring" is the quieter of the two offered by Corsa. Here is the link if you want to hear the difference.
Corsa Performance
In case the link doesn't work just do a search on Google for Corsa Exhaust. or go to corsaperf.com and follow the links.
engine/Exhaust sound; at idle you would not know that anything has been done to the rig. Perhaps a bit lower rumble but nothing you can hear inside the cabin. The SC is completly quiet at idle. Put your foot into it and just watch heads turn as you scream down the street. Just be careful and watch for cops. They'll hear you coming before the radar picks you up.
The SC has a distinct sound when under acceleration.
If you do much hwy driving you will happy to know that any resonates inside the cab from the exhaust are pretty much undetectable. It is as quiet as stock was except under acceleration then you know even in the cab with the windows rolled up that you've done something to the engine.