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Message: <blockquote data-quote="SpeedJunkie" data-source="post: 1232671" data-attributes="member: 24927">No, it was MPT 91 PR-X.I'll caveat this by saying I am not necessarily blaming the tune. I never really dug into it to try and find out the exact cause.Other info that might be relevant: Truck was tuned at about 2k miles. Engine blew at 33K. I was doing around 35mph when it happened under moderate to heavy acceleration, but not bouncing off the rev limiter or anything like that. I always used at least 91 octane from the same station and pump, unless I was traveling long distance. It wasn't really hot (70s-80s), but pretty humid and muggy that day. Only other engine mod was a 170 degree stat.</blockquote>

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