FOr those of you who have boughten one, did yours come with a small restrictor valve for the vacuum line? I was reading the papers that came with it and it said I have to put that inline, but mine didn't come with it. Thanks

I bought one new and it came with one. I don't know how important it is to use it though.

It should come with it. The restictor looks like a 1.5" or so long piece of silver tubular metal, that you can connect a vac hose to each end. I have talked to Vortech directly on several occasions, and they said each time that you DO need to use it. The SFMU may not work as intended or the fuel pressure may not be as steady and smooth as it should be. I've never run without it, so I'm not sure what effect it really has when you dont use it.

Its cool, I called vortech and had to fax my order from summit but they will send me one.

It is a nice valve.

I no longer use an SFMU, but I still use that same "smoothing out" valve for my EIC. I had bouts of hiccuping (felt like fuel cut) when going into boost when I romped on the gas as far as my fueling before using the valve. However, after corresponding with JAvad, he advised me to use such a valve to prevent the harsh nature of the boost signal to the MAP sensor.

This impliedly leads me to believe that when the boost goes up suddenly through the vacuum lines to a bosot reading device (MAP, FMU's...etc.), it can make it somewhat difficult to read it accurately given the turbulence of the signal and cause fueling issues.