pretty basic stuff, just know that headers will make those Corsas louder.
C6 ls3
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St. Jude Donor '13
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I have Headers/Cats and the Corsa Sport and there is drone around 1500 thru 1800. The headers wake up the Corsa some. I just went with 4.10 Differential now at 70 I am doing 1800 rpm, better for cruising above drone zone. No drone with just Corsa.
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Drifting
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St. Jude Donor '09-'10-'11
Heads/Cam
You've got a good set of heads on it already. If you port the heads and put a cam package together, you won't need better heads. Everyone has their favorite, but what you need to know is: What is your intended use and expectations--that opens the door to design specs. 
