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reving to 5.5 isnt going to hurt it at all...tell your brother to shut up. The only thing youre doing is wasting gas and forcing loose carbon build-up off your head parts.
Its good to rev your engine high now and then (I do it several times per tank, every tank).
Get either a denso or oem o2 sensor...nothing else. Trust me. The bosch are shi-at and WILL die quickly.
Denso will be cheaper than oem (but is oem spec and is what honda uses stock).
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