I was reading earlier int eh forim that stoke GSR's shouldn't go any higher than 310cc injectors. I was wondering if it changes if i got CTR cams headers skunk mainifold and AEM fuel rail?? Thanks

 

It's because the stock ECU can't run injectors bigger than that properly. You could always have your ecu reprogrammed for whatever you are doing. Of course if CTR cam's and a S2 manifold are all you are doing you probably don't need injectors much bigger than stock.

 

don't think you'll need it. you probably won't be shoving massive amounts of air in there. don't forget the valvesprings and retainers to go along with the CTR setup!