go to your local shop, they should be able to build you one, i live in florida and had one built with the bypass valve for cheaper and i think it works better, in the end they use the same filter and valve so there isn't much difference in making one yourself or having a shop build you one than if you buy an aem, why risk hydrolock, in all reality you probably never will, but for something so expensive and small a detail why risk it, get the bypass valve