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I am really starting to wonder if your limit at this point is your stock DP. That adds a lot of back pressure and likely results in higher in cylinder temps. That could explain the timing drops. I am really curious to see the timing after you get the pipes in stalled.
EDIT: One other way to see if the timing drops are knock retard (KR) is to run some ethanol or MS109 through the vehicle. Just a few gallons will work, then log again and see if the timing drops go away.
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