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 Harley’s true potential with NGK Iridium IX!

IRIDIUM EDGE TECH - Ultra-small 25% smaller iridium electrode means less voltage needed and longer ignition life.
POWER SURGE READY - Unlock up to 3 extra horsepower and feel the difference on every ride.
PRECISION PRE GAPPED - Save time and hassle with plugs perfectly set for optimal ignition.
TRUSTED INDUSTRY LEADER - NGK’s cutting-edge spark plug technology trusted by Harley Davidson pros.
CORROSION RESISTANT ARMOR - New metal shell plating guards against rust and wear, keeping your ride reliable.

NGK Iridium IX DCPR7EIX spark plugs deliver superior ignition performance for 1999-2016 Harley Davidson Twin Cam models. Featuring a 25% smaller iridium electrode, these pre-gapped plugs reduce voltage requirements, extend ignition system life, and provide up to 3 horsepower gain. Enhanced with a corrosion-resistant metal shell, they ensure durability and reliability for passionate riders seeking peak engine efficiency.

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Manufacturer	NGK
Brand	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
Item Weight	40.8 g

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

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