2017 highlander v6 manual says i need (denso 3491) 0.031 gap, but amazon & rock auto says this denso 4705, 0.040 gap fits?

I can't honestly answer your question. I bought for a 2006 Lexis IS350. I've had no issues.

Are these legit products?

Yes, very good original equipment plug in the Tacoma. Had mine in for over 45K now. No problems.

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Denso Spark Plug Iridium TT - 4705

Product ID: 21944297

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Details

Brand
Denso
Core Material
Iridium
Thread Size
14mm
Top Material Type
Iridium
Vehicle Service Type
UTV

⚡Iridium core for max spark power

🔋Low voltage requirement boosts efficiency

🚗Fits wide range of OE vehicles

Description

⚡ Ignite your drive with power and precision!

EFFICIENT IGNITION - Low voltage requirement ensures quicker starts and improved combustion efficiency.
PRECISION IRIDIUM CORE - Delivers a larger, more powerful spark for enhanced engine performance and fuel economy.
DURABLE MACHINED EXTERIOR - Crafted for longevity and consistent performance under demanding conditions.
UNIVERSAL OE COMPATIBILITY - Optimized to fit a broad spectrum of original equipment vehicles without compromise.
AFFORDABLE HIGH TECH UPGRADE - Experience advanced spark plug technology without breaking the budget.

The Denso Spark Plug Iridium TT - 4705 features a high-performance iridium core that produces a larger spark for superior fuel economy and engine output. Designed with low voltage requirements, it enhances combustion efficiency and fits a wide range of OE vehicles, making it a durable, affordable upgrade for optimized vehicle performance.

Specifications

Brand	Denso
Core Material	Iridium
Thread Size	14mm
Top Material Type	Iridium
Vehicle Service Type	UTV
Global Trade Identification Number	00042511047051
Automotive Fit Type	Vehicle Specific Fit
UPC	042511047051
OEM Part Number	DENS7
Manufacturer	Denso
Model	Spark Plug Iridium TT
Item Weight	1.6 ounces
Product Dimensions	3.66 x 0.98 x 0.98 inches
Item model number	IKBH20TT
Is Discontinued By Manufacturer	No
Exterior	Machined
Manufacturer Part Number	4705
Position	Center

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