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three culprits I can think of:
- over-temp - cyls go oblong and pistons score cyls
- bad aos - no vacuum to crankcase so piston rings don't function properly; pistons score cyls
- over-rev - all bets off
I don't think engine mods will have much effect unless they push you into a lean condition and start making thinks hot, or timing goes off. from what I've seen (check out insite's wideband o2 post) the ecu tends to keep even a heavily modified engine in the safe zone.
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