Will these fit a 2015 Nissan Altima S?

Not sure, unless its still the same 4 cyclinder, QR25DE engine. If its the QR25DE it will fit.

Do you need to gap these?

I always check, carefully. I have heard that you damage the contacts, but I've got a pretty light hand with a feeler gauge. That said, I've never had one come up gapped wrong in the last 10 years... These being no exception.

Manufacturer	NGK
Brand	NGK
Model	9029
Product Dimensions	11.05 x 5.69 x 5.28 cm; 45 g
Item model number	9029
Manufacturer Part Number	DILKAR6A11
OEM Part Number	9029
Position	Unknown
Item Weight	45 g

(9029) DILKAR6A-11 Laser Iridium Spark Plug, Pack of 1

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