Ebay GT45 + 5.9 Magnum + E85 blow thru

V8-valiant said

I thought the Fitech had a built in FPR and that you didn't have to run one? What's the block on the firewall with all the hoses going to it, vacuum distribution?

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It does have the built in FPR, but I read on the turbo forums that the return port on the FiTech is really small (which I confirmed) and would not flow well in a high volume application like this. So, I'm going to use my Aeromotive but opened all the way and be the source for the return line (which is already plumbed) and let the FiTech regulator control pressure.

Yes, the block on the firewall is a distributor block for your pressure signal. Ebay piece. Helps organize all of that spaghetti of vacuum hose. Main signal comes off the back of the carb hat and from there is distributed to the wastegate, BOV, boost reference port of the FPR. The later will now be routed to the boost reference port on the FiTech.