---
product_id: 30955245
title: "NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/--"
brand: "ngk"
price: "339 zł"
currency: PLN
in_stock: true
reviews_count: 13
category: "Ngk"
url: https://www.desertcart.pl/products/30955245-ngk-cr9eix-iridium-ix-spark-plug-4-pack
store_origin: PL
region: Poland
---

# Iridium core for superior ignition Enhanced combustion power Direct OEM replacement fit NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/--

**Brand:** ngk
**Price:** 339 zł
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your ride with NGK Iridium IX – where power meets precision!

## Quick Answers

- **What is this?** NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/-- by ngk
- **How much does it cost?** 339 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/30955245-ngk-cr9eix-iridium-ix-spark-plug-4-pack)

## Best For

- ngk enthusiasts

## Why This Product

- Trusted ngk brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Perfect OEM Fitment:** Seamlessly replace your spark plugs without any hassle—guaranteed vehicle-specific compatibility.
- • **Value-Packed 4-Pack:** Stock up and save with a convenient bundle designed for multiple replacements or upgrades.
- • **Durability That Lasts:** Built to withstand extreme conditions, ensuring consistent performance mile after mile.
- • **Boosted Engine Performance:** Feel the power surge with improved combustion and quicker starts every time.
- • **Precision Iridium Technology:** Experience unmatched spark efficiency and longevity with NGK's premium iridium core.

## Overview

The NGK CR9EIX Iridium IX Spark Plug 4-pack delivers high-performance ignition with a durable iridium core, ensuring reliable starts and enhanced engine power. Designed as a direct OEM replacement, these plugs fit vehicle-specific requirements perfectly, making them a trusted choice for cars and trucks seeking improved combustion efficiency and long-lasting durability.

## Description

Genuine 4 pack NGK Iridium IX 3521 Spark Plug

Review: GOOD PRODUCT - VALUE WAS GREAT FOR QUALITY. FIT WAS PERFECT START WAS RIGHT ON. POWER WAS IMPROVED. DURABLE AS IT SHOULD BE
Review: Good - Great price for these quality spark plugs. My bike is running better!

## Features

- 4 pack NGK Iridium IX 3521 Spark Plug
- Genuine NGK Parts
- Includes original packaging and hardware
- Direct replacement auto parts
- Confirm vehicle fitment with desertcart Confirmed Fit

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004SKYAWM |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #7,496 in Automotive ( See Top 100 in Automotive ) #31 in Automotive Replacement Spark Plugs |
| Brand | NGK |
| Core Material | Iridium |
| Customer Reviews | 4.8 4.8 out of 5 stars (486) |
| Date First Available | April 10, 2012 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 4.5 ounces |
| Item model number | 3521 |
| Manufacturer | NGK |
| Manufacturer Part Number | CR9EIX |
| Model | 4 pack NGK Iridium IX 3521 Spark Plug |
| OEM Part Number | 7085731 |
| Position | Front, Rear |
| Product Dimensions | 3.31 x 0.94 x 3.32 inches |
| Thread Size | 10mm |
| Top Material Type | Iridium |
| Vehicle Service Type | Car, Truck |

## Product Details

- **Brand:** NGK
- **Core Material:** Iridium
- **Thread Size:** 10mm
- **Top Material Type:** Iridium
- **Vehicle Service Type:** Car, Truck

## Images

![NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/-- - Image 1](https://m.media-amazon.com/images/I/61wBxBvQUhL.jpg)

## Questions & Answers

**Q: Are these ngk 3521 cr9eix iridium ix spark plugs?**
A: These are correct and they perform flawlessly! Ron

**Q: Will these fit a 2019 polaris rzr turbo s**
A: To be safe: check with dealer or a cross reference app to be sure. Ron

**Q: Will this work on my Harley Davidson 2018 street glide special?**
A: I have a 2017 Road King with the Milwaukee 8 and this is the one it calls for.

**Q: Are these the right iridium plugs for an Indian scout 60?**
A: NGK has multiple grades of plugs that may fit your engine.  
It is recommended to go to NGK site at
https://ngksparkplugs.com/en/part-finder to verify the applications that will fit your engine.
This site will show you all of the available plugs to fit your engine and will also show you which grade plug is recommended for the best performance of your specific engine.

## Customer Reviews

### ⭐⭐⭐⭐⭐ GOOD PRODUCT
*by M***. on February 20, 2026*

VALUE WAS GREAT FOR QUALITY. FIT WAS PERFECT START WAS RIGHT ON. POWER WAS IMPROVED. DURABLE AS IT SHOULD BE

### ⭐⭐⭐⭐⭐ Good
*by D***. on December 2, 2025*

Great price for these quality spark plugs. My bike is running better!

### ⭐⭐⭐⭐⭐ Great plugs
*by B***L on October 15, 2025*

I installed these in my 2021 Indian Scout Bobber ABS. I can see the improvement over the regular plugs. The bike starts better and runs better at idle and full throttle. I recommend them.

## Frequently Bought Together

- NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/--
- K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils, Wrench Off Nut: Fits Select Suzuki Motorcycles, KN-138
- K&N Engine Air Filter: High Performance, Premium, Powersport Air Filter: Fits 2006-2010 SUZUKI (GSXR600, GSXR750) SU-7506

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**Shop now:** [https://www.desertcart.pl/products/30955245-ngk-cr9eix-iridium-ix-spark-plug-4-pack](https://www.desertcart.pl/products/30955245-ngk-cr9eix-iridium-ix-spark-plug-4-pack)

---

*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-03-21*