Ignitions and Electrical› Ignition Components

ZZPERFORMANCE

Iridium Spark Plug

$29.94

SKU: LTR6IX-11-4

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

Its iridium center electrode provides maximum spark energy for higher ignitability. These plugs are built to last between 40,000 and 50,000 miles.
Show original supplier description
The NGK Iridium IX Spark Plug (Part Number 6509, LTR6IX-11) is engineered for superior performance and longevity, making it an upgrade over OEM, V-Power, G-Power, and standard spark plugs. Its ultra-fine iridium center electrode maximizes spark energy, leading to enhanced ignitability and improved acceleration. These durable plugs are designed to last between 40,000 and 50,000 miles, ensuring reliable operation in demanding conditions. Constructed with trivalent metal plating for exceptional anti-corrosion and anti-seizing properties, the Iridium IX plugs can withstand the high temperatures characteristic of fuel-injected and turbocharged engines. The iridium alloy is significantly harder and stronger than conventional platinum. NGK, the world's leading spark plug supplier, ensures quality and performance through its extensive research and partnerships with auto manufacturers. These spark plugs are pre-gapped for general use but recommend adjusting the gap to meet the specific requirements of your application. The NGK 6509 LTR6IX-11 is compatible with a wide range of vehicles, including specific models from Buick, Cadillac, Chevrolet, Ford, GMC, Jaguar, Land Rover, Lincoln, Mazda, Pontiac, Saab, Saturn, and Suzuki, covering various engine sizes and model years. Always verify fitment for your specific vehicle before purchase.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandZZPERFORMANCE
Part NumberLTR6IX-11-4
CategoryIgnitions and Electrical

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy