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Fix the exhaust leak first and check it. I was running out of lowside fuel on 91 when I should have easily been fine with my mods. Leak right in front of the wideband was causing it to read leaner than actual like others have said. Lambda was way richer then we were seeing. Fixed the leak, and lambda was way rich at WOT. Adjusted the tune, wouldn't you know lowside pressure was fine. Did some unnecessary upgrades to the fuel line like LPE check valve just to figure out it had nothing to do with the stock fuel line.
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