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Thanks everyone! Lots of good input! So far no one has disagreed with my 4.10 gear swap idea, so that's likely where I'm headed for now. For the headers, it sounds like I need to either modify the existing cats, buy the DKF section 1 and cats, or buy euro cats to relocate the O2 sensors; or risk a tune not being able to return a readiness code. Also seems to be the consensus that while a tune isn't necessary with relocated sensors, I may want it nonetheless for maximum gains. Anyone disagree with that summary?
More importantly, does anyone think I should prioritize the header swap over the diff? If so, why? I may do both eventually, but not this year...
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