In fact, HRC does include one.

I wouldn't say it's an essential piece, but what it does is provide an out for the boost after it goes through the adjustable FPR. (The extra signal sending air/boost needs an out.) So here's where the check valve sits: The vacuum line runs from the intake plenum to the adjustable FPR, and then the FPR has a vacuum line that runs off of it to the check valve. If you didn't have a check valve here, it would be like a small vacuum leak in your system.

Now, I'm not sure if the Vortech requires one, but a HRC adjustable FPR (Bell) certainly does.


Jason
98' Eagle Talon ESi-T
Mitsu Super 16g Turbo(HRC)


http://springfielddsm.homestead.com/JasonsPics.html

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Jason ESi-T

04' BMW 325Ci
91' Nissan 240SX
98' Eagle Talon ESi (sold)