Direct injection engines are also able to be run much richer and still meet EPA guide lines. As a result when you remove the cats from the equation, you often get a serious raw gas smell
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+1 for keeping your cats and if you're trying to get every pony in there- go for a quality high flow cat like Solo. They're a really nice 200 cell cat that improves flow over stock but will keep the gas smell and rasp out of your sound. Every part is stainless steel. Their online catalog isn't showing an offering for the 6thGen, but I'm sure it will soon. Contact Steve using the info here at the bottom of this web page-
http://solo-performance.com/pe-camaro-ls3-std . I'm sure he can hook you up!
