Should I gap to my owners manual spec or are they designed to work with the smaller pre-gap they came with?

Harley Davidson recommends 0.40" gap. As to "You should never gap an iridium plug", NGK's website states for Harley Davidson, these should be gapped at 0.40". I've found many websites stating that if re-gap is needed use care not to damage the electrode or the porcelain center. So, it's not that you should not re-gap, it's that you should be extremely careful.

Is this 6r12, if so why does it not say so ?

Because these plugs are IX DCPR7EIX 99 TO 16 HARLEY-DAVIDSON

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⚡ Ignite your ride with NGK Iridium IX – where power meets precision!

PLUG PLAY - Comes pre-gapped for hassle-free installation and optimal spark every time.
TAILORED FIT - Specifically designed for 1999-2016 Harley Davidson Twin Cam models ensuring perfect compatibility.
CORROSION SHIELD - New metal shell plating guards against rust and wear for long-lasting performance.
POWER SURGE READY - Unlock up to 3 extra horsepower with precision ignition.
PRECISION ENGINEERING - Ultra-small iridium center electrode reduces voltage needs and extends ignition life.

NGK Iridium IX DCPR7EIX spark plugs deliver advanced ignition technology with a 25% smaller iridium electrode that boosts horsepower by up to 3HP, reduces voltage requirements, and extends ignition system life. Featuring enhanced anti-corrosion metal shell plating and pre-gapped for easy installation, these plugs are engineered specifically for 1999-2016 Harley Davidson Twin Cam motorcycles.

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€ 87.05

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Brand	NGK
Core Material	Iridium
Thread Size	12mm
Top Material Type	Metal
Vehicle Service Type	Motorcycle
Automotive Fit Type	Vehicle Specific Fit
UPC	700155016542
Manufacturer	NGK
Model	NGK DCPR7EIX
Product Dimensions	8.41 x 2.39 x 2.11 cm; 40.82 g
Item model number	DCPR7EIX
Exterior	Painted
Manufacturer Part Number	DCPR7EIX
Position	Front, Rear
Assembly Required	No
Manufacturer	NGK
Item Weight	40.8 g

NGK Iridium IX DCPR7EIX Spark Plugs for 1999-2016 Harley Davidson Twin Cam (Pair)

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