Have a guy at work with a 2011 camaro ss...according to him, only cam and full exhaust ...headers back. (which i'm sure means a tune as well) He claims 500 hp but also said he gapped a 2016 GT350. i have a 2012 GT500 with cold air and a k&n...was wondering how you guys think this turns out? i'm pretty confident if he is telling me the truth...