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

Details

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

⚡0.4mm ultra-fine iridium electrode

🔥Twin-tip design for max combustion

🔩26.5mm thread length for perfect fit

€ 39.98

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Ignite Power & Precision — Drive the Future Today!

EMI NOISE ELIMINATOR - Embedded monolithic resistor blocks electromagnetic interference, protecting your vehicle’s sensitive electronics for seamless performance.
TWIN TIP TURBOCHARGE - Innovative 0.7mm platinum ground electrode paired with iridium center ignites fuel with razor-sharp efficiency, boosting acceleration and fuel economy.
LASER WELDED DURABILITY - 360° all-around laser welding ensures rock-solid electrode bonding, built to withstand the harshest driving conditions without fail.
PRECISION IGNITION MASTERY - Ultra-fine 0.4mm iridium center electrode slashes spark voltage for lightning-fast starts and peak engine power.
PERFECT FIT EFFORTLESS UPGRADE - Designed with a 26.5mm thread length and 14mm diameter, this plug fits premium Lexus and Toyota models flawlessly—upgrade your ride with confidence.

The DENSO Iridium TT Spark Plug IKBH20TT features a cutting-edge twin-tip design combining a 0.4mm iridium center electrode and a 0.7mm platinum ground electrode, laser-welded for unmatched durability. Engineered to maximize combustion efficiency, it delivers improved acceleration, fuel economy, and longevity. With an embedded resistor to eliminate electromagnetic noise and a precise 26.5mm thread length, it’s the premium replacement spark plug for Lexus and Toyota vehicles seeking high performance and reliability.

Specifications

ASIN	B00TPU9BWO
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	215,474 in Automotive ( See Top 100 in Automotive ) 1,024 in Car Spark Plugs
Brand	Denso
Brand Name	Denso
Compatible with Vehicle Type	Car, Van
Core Material	Iridium
Core material	Iridium
Country Of Origin	Japan
Customer Reviews	4.7 out of 5 stars 224 Reviews
Gap Size	1 Millimeters
Global Trade Identification Number	00042511047051
Included Components	Iridium TT Spark Plug x1
Item Type Name	Spark Plug
Item Weight	52 Grams
Manufacturer	Tetrosyl Express Limited
Manufacturer Part Number	IKBH20TT
Manufacturer Warranty Description	2 Year Manufacturer
Model Number	IKBH20TT
OEM Equivalent Part Number	DENS7
Thread Size	26.5 millimetri
Thread size	26.5 millimetri
Top Material Type	Iridium
Top material type	Iridium
UPC	042511047051
Unit Count	1 count
Vehicle service type	Car, Van

Reviews

H**Y

Original. Great buy.

Great buy. Original

16.02.2026

J**E

3rd gen Tacoma plugs

Great spark plugs direct fit for my 3rd gen Tacoma

8.07.2026

P**G

Oem for sure!

Legit item, works as it should.

13.04.2026

G**M

Great Spark Plugs!

Immediately noticed a performance increase after installing these plugs in my 3rd Gen Tacoma. Not disappointed!

9.02.2026

V**A

Better than Bosch.

Definitely worth it to buy, my husband bought boshe I think its called but the lower end of boshe and it kept causing our truck to missfire. Both brand new, but Denso did its job. No more deceleration on the RPM when its idling.

6.03.2026

T**E

Spark plugs

Good quality

30.05.2026

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Ravi S.

I loved the variety of products available. Will definitely shop again.

2 months ago

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€ 39.98

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

View all Trustpilot reviews