I mounted mine to the fuel rail. But I'm using a small OEM regulator off of Nissan or Toyota or something. I wanted compactness and since I run an aftermarket EFI, as long as it has a one-to-one reference Port, it really doesn't matter. The only thing to note is that my pump will overpower the regulator pretty easily on the street so I use the EFI to drop the voltage to the pump. Which is a good idea anyway, once you start getting up there hp-wise, at least on a street car, there's no reason to circulate that much fuel all the time. The only thing I would do differently next time is to stage two pumps as opposed to cutting voltage to one big pump.