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You might have helped me figure my issue. The two MAF are way off. Replacing both mafs and pigtails. Shame my dealership couldn't figure out what was wrong. Simply gave up and said "your car's too modified"...

Tracking it has nothing to do with the HPFP, dealership argued that it the HPFP was suspected to be leaking so I elected to allow them to replace it (extended warranty covered most of it). I was running my intake for over a year without issue, it was immediately after the DP install did I have...

Curious to know what fixed your car? I've had the 16E7 code after installing downpipes, without resolve. The local Cadillac dealer took a crack at it (costing me 1k), changed a HPFP, before throwing their hands up stating it's too modified (CAI, DPs, and tune) for them to work on