Ok, I know this topic has been literally beaten to death, but... I am currently using the HKS core used in the hotshot turbo kit as well as several others and it seems relativley small compared to other I have seen. According to my research it is a relatively efficient core for the size, however, I think a larger one could be made to fit. Anyone with any opinions on the matter. Is a larger core worth it? If so does anybody have specific recomendations. I have a few more months before the engine is ready and I am getting restless, very restless.