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06-06-2011
Most likely whoever did your tune thought it would be a good idea to add a bunch of timing. It's tough to say though without seeing the BIN file.
How much timing are you commanding at WOT?
What kind of boost levels are you seeing?
3.4 with headers could knock a decent amount if someone turned the timing up.
06-07-2011
You say you have an exhaust leak on the front manifold. Fix it. Between possibly blowing noise at the knock sensor and pulling in air that will show your exhaust as lean... this could easily be causing KR.
ZZP S1 TB. Was this tuned for? Many times I see these without a maf screen. That could easily cause a lean condition. If this wasn't tuned for, then likely it's helping cause KR.
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