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

Product ID: 254497229

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Details

Brand
NGK
Core material
Nickel
Thread size
12mm
Top material type
Metal
Vehicle service type
Motorcycle

⚡Up to 3HP power boost

🔧Pre-gapped for perfect fit

🛡️Enhanced anti-corrosion plating

Description

⚡ Ignite your ride with NGK’s ultimate spark power!

POWER SURGE READY - Unlock up to 3 extra horsepower instantly with cutting-edge iridium tech.
PRECISION PRE GAPPED - Save time and ensure flawless ignition with factory-set gaps.
ULTRA SLIM ELECTRODE - 25% smaller iridium tip means lower voltage needs and longer ignition life.
TRUSTED INDUSTRY LEADER - NGK’s proven spark plug technology keeps your Harley roaring from 1999-2016.
CORROSION RESISTANT ARMOR - New metal shell plating guards against rust and wear for lasting durability.

NGK Iridium IX DCPR7EIX spark plugs deliver superior ignition performance for 1999-2016 Harley Davidson Twin Cam models. Featuring a 25% smaller iridium electrode, pre-gapped precision, and enhanced anti-corrosion plating, these plugs boost horsepower by up to 3HP while extending ignition system life.

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Excellent communication throughout the order process. Product is perfect.

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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	Center
Item Weight	40.8 g

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

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