Replacement is absolutely fine as an option, but I recommend going with a genuine brand as originally specced for the vehicle (Denso, AC Delco etc). Some aftermarket brands like Jaylec (just an example of brand, not quality) aren't built to the same standard and can be underpowered.
Denso Designer Hybrid is my favorite for all the Fit model years if you can find them. They’re the ones that come from the factory on the 09-13 models. You can get the rubber inserts from the Honda dealer for really cheap and keep your frames for a while.
I’ll stick with NGK and Denso.
Denso, nippon, aisin are the only brands you should be looking at for an acura.
I bought the absolute cheapest plugs available ($1.50/plug), and they are branded "Denso Toyota Iridium" - I assume fakes, but my magnifying glass does seem to show an iridium tip, and they work great.
I replaced mine at 129k miles due to a small leak in the bottom of the radiator. I purchased an OEM Denso one on Amazon for 220 and it's been working great, no issues with trans temp as well.
DIY Guy here, I always use Denso parts for my Hondas when it comes to electrical stuff. Denso is the OEM parts supplier for Honda's alternators. I just replaced an alternator in my sister's 2011 Acura RDX with a remanufactured Denso unit and she's had no problems with it at all.
That mechanic must be using some really cheap alternators, we use denso alternators where I work and rarely have issues.
I wouldn't recommend buying a noname brand though and rather go for remanufactured denso or whatever the original was.
Denso is usually one of the top ones, if they've tanked in quality I shudder to think how bad oem GM, and mopar/stellantis has gotten. I still have nightmares from absolute shit quality of GM parts, alternators and starters barely lasted over a year.
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