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 Iridium TT Spark Plug - IKBH20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug Fits Lexus ES GS IS C LS RX RC LC, Toyota Crown Camry Mark X

DENSO Iridium TT Spark Plug - IKBH20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug Fits Lexus ES GS IS C LS RX RC LC, Toyota Crown Camry Mark X

Product ID: 92389816

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Details

Brand
Denso
Core material
Iridium
Thread size
26.5
Top material type
Iridium
Vehicle service type
Car Van

⚡φ0.4 mm iridium center electrode

🔥Twin Tip design for max flame kernel

🔧22 Nm tightening torque

Description

⚡ Ignite your drive with precision and power!

PERFECT OEM FIT - Specifically engineered for Lexus & Toyota models, ensuring seamless installation
TWIN TIP TECHNOLOGY - Double needle electrode boosts acceleration and fuel efficiency
LASER WELDED DURABILITY - All-around laser welding ensures peak performance under extreme conditions
PRECISION IGNITION POWER - Ultra-fine iridium tip reduces spark voltage for lightning-fast starts
ELECTROMAGNETIC NOISE SHIELD - Built-in resistor eliminates interference for smooth engine operation

The DENSO Iridium TT Spark Plug IKBH20TT features a cutting-edge twin tip design with a 0.4 mm iridium center electrode and 0.7 mm platinum ground electrode, laser-welded for unmatched durability. Engineered for Lexus and Toyota vehicles, it delivers improved acceleration, fuel economy, and longevity while minimizing electromagnetic interference, all secured with a precise 22 Nm torque fit.

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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Manufacturer	DENSO Corporation
Brand	Denso
Model	IKBH20TT
Product Dimensions	9.3 x 2.5 x 2.5 cm; 45.36 g
Item model number	IKBH20TT
Manufacturer part number	4705
OEM Part Number	DENS7
Position	Centre
Item Weight	45.4 g

DENSO Iridium TT Spark Plug - IKBH20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug Fits Lexus ES GS IS C LS RX RC LC, Toyota Crown Camry Mark X

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