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V8 5.0L Engine / Mods: Bolt-ons, Exhaust, Tuning Discussions of the S550 2015+ Mustang 5.0L V8 engine (Coyote) and engine/exhaust/bolt-on modifications


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Old 02-17-2018, 10:45 PM   #1
Joe 5.0
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Upgrade spark plugs when changing manifold? Will be running flex fuel tune.

Just as the title states -- should I upgrade my spark plugs when switching intake manifolds since they'll be easily accessible? I will be running a Lund flexfuel tune and will see E85 once in a blue moon.

Any performance benefits?

2015 GT w/ 18,000 miles on stock plugs.
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Old 02-17-2018, 10:49 PM   #2
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Iíll be upgrading myself next week and would like to know as well.
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Old 02-20-2018, 02:02 PM   #3
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If anything, just check that the stock ones are gapped correctly. At that mileage and with those mods, you don't really need to do them but I have seen stockers range quite a bit in their gap from the factory.
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