Is there a way to determine if these are genuine Denso?

They have the brand marked in the porcelain and came in a denso pack. I have three years of usage in my toyota and runs like new

Do I need to use anti seize lubricant when I install Denso sparks plugs?

In the old days we always used anti seize on plugs going into aluminum heads. Apparently not anymore as a factory certified Toyota mechanic recently stated in a YouTube video that using antiseize is not recommended and can actually cause the plugs to seize up. I checked this out on the NGK site and they state that plugs are manufactured with a coating today to prevent seizing. Applying antiseize to these plugs reduces friction by 20% leading to overtightening and later to seizing. So no, don't use anti seize!

Ya vienen calibradas?

Estás bujías vienen calibradas,

Does this work fine for a 2003 celica gt? not gts one.

I am sure that these will work just fine for you. I have a 2001 Toyota Corolla and since yours has the same motor, they will work just fine. I did have to purchase a couple of coils but they may or may not be required for your peticular application. I do recomend these plugs. Great value and product for the price.

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⚡ Ignite your drive with DENSO’s iridium edge!

QUAD PACK VALUE - Get four genuine DENSO spark plugs in one set—perfect for a full engine refresh or trusted backup.
IRIDIUM POWER BOOST - Experience superior ignition with ultra-durable iridium tips for longer engine life and peak performance.
LIGHTWEIGHT COMPACT - At just 1.44 ounces each, these plugs deliver high performance without adding bulk.
OEM QUALITY ASSURANCE - Manufactured by Denso Sales California, Inc., these plugs meet or exceed original equipment standards.
PRECISION FIT GUARANTEE - Designed to match your vehicle’s exact specifications, ensuring hassle-free installation and optimal function.

The DENSO 3324 Iridium Long Life Spark Plugs (SK16R11) come in a 4-pack of genuine, vehicle-specific spark plugs featuring a durable iridium core and 14mm thread size. Engineered for cars and trucks, these OEM-quality plugs ensure reliable ignition, longer lifespan, and seamless installation, making them an essential upgrade for performance-focused drivers.

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Brand	Denso
Core Material	Iridium
Thread Size	14mm
Top Material Type	Iridium
Vehicle Service Type	Car, Truck
Automotive Fit Type	Vehicle Specific Fit
OEM Part Number	3324
Manufacturer	Denso Sales California, Inc.
Item Weight	1.44 ounces
Product Dimensions	3.62 x 3.84 x 0.96 inches
Item model number	SK16R11
Is Discontinued By Manufacturer	No
Manufacturer Part Number	3324
Position	Center

DENSO # 3324 Iridium LONG LIFE Spark Plugs -- SK16R11 ----- 4 PCS NEW

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