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Deleted member 35644
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It's safe to assume that wear increases with power output. It's not a linear rise, but it's a rise. Life expectancy of an engine goes down if it has to work harder, that's just a law of nature. This applies to the rest of the drivetrain as well. Bumping the 2.3 up 100 hp will decrease overall life expectancy (i.e. it wears out), but that doesn't take into account any weak links in the chain that may actually break under that much additional stress. You'll be fine modding to a point, but after that point, you're putting your drivetrain in jeopardy, which for me, isn't worth it in a daily driver. Past a certain point of additional power output, wear stops being of as much concern as stuff actually breaking. I think a few guys on this forum may have found that fine line. If it were me, I'd stick with a Ford tune (if there is one for the Mustang...I haven't looked into it) and all Ford aftermarket parts. They've done their homework on what this car can handle and still be reliable, as it's still their warranty dollars they're spending. I'm still considering adding their tune to my Focus ST, and I'd do it without concern.
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