'13 427 60th vert - '25 Eray Hysteria Purple - CTS V Wagon(4-door Vette)
What he said - not much.
Especially with the NPP on the '08 and beyond.
Now with that said, I can say that the CORSA does make a difference on the C4 and I have the dyno sheets to prove. But on the C6, it's the sound that makes the difference not the HP.
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