---
product_id: 58843717
title: "Iridium TT Spark Plug - IW20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug Fits Fiat Mercedes-Benz Honda MG Nissan Porsche Renault Subaru VW Hyundai Daewoo Lotus"
brand: "denso"
price: "$41.98"
currency: USD
in_stock: true
reviews_count: 5
category: "Denso"
url: https://www.desertcart.us/products/58843717-iridium-tt-spark-plug-iw20tt-twin-tip-the-powerful-premium
store_origin: US
region: United States of America
---

# φ0.4mm Iridium center electrode Twin Tip design for max power 14mm diameter, 19mm thread length Iridium TT Spark Plug - IW20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug Fits Fiat Mercedes-Benz Honda MG Nissan Porsche Renault Subaru VW Hyundai Daewoo Lotus

**Brand:** denso
**Price:** $41.98
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite Performance, Drive with Confidence!

## Quick Answers

- **What is this?** Iridium TT Spark Plug - IW20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug Fits Fiat Mercedes-Benz Honda MG Nissan Porsche Renault Subaru VW Hyundai Daewoo Lotus by denso
- **How much does it cost?** $41.98 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/58843717-iridium-tt-spark-plug-iw20tt-twin-tip-the-powerful-premium)

## Best For

- denso enthusiasts

## Why This Product

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

## Key Features

- • **Twin Tip Technology:** Double needle electrode accelerates flame kernel for peak engine power and efficiency.
- • **Laser-Welded Durability:** All-around laser welding ensures unmatched reliability under extreme driving conditions.
- • **Wide Vehicle Compatibility:** Fits premium brands like Mercedes, Porsche, Honda, VW, and more—upgrade your ride effortlessly.
- • **Electromagnetic Noise Suppression:** Built-in resistor eliminates interference, protecting your vehicle’s electronics.
- • **Precision Iridium Center Electrode:** Ultra-fine 0.4mm tip reduces spark voltage for lightning-fast ignition.

## Overview

The DENSO Iridium TT IW20TT spark plug features a precision 0.4mm iridium center electrode and a twin tip design that maximizes ignition efficiency and engine power. Engineered with laser welding for durability and a built-in resistor to prevent electromagnetic interference, it fits a wide range of premium vehicles including Mercedes-Benz, Porsche, Honda, and VW. This premium spark plug delivers improved acceleration, fuel economy, and longevity, making it the ultimate upgrade for discerning drivers.

## Description

Buy DENSO Iridium TT Spark Plug - IW20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug Fits Fiat Mercedes-Benz Honda MG Nissan Porsche Renault Subaru VW Hyundai Daewoo Lotus at desertcart UK. Free delivery on eligible orders.

Review: Genuine Denso - Great spark plug, I checked these carefully on receipt to make sure they where genuine (as there are a lot of fakes about).
Review: After using Denso's iridium tt plugs in my truck and van and getting great results. I found a TT plug with the proper reach, thread and heat range for my GeneRac GP5500, Denso (4709) IW20TT Iridium TT. Really easy starting, very stable with varing loads. You will know you are using a TT plug the first instant the engine starts because it sounds slightly different.

## Features

- IW20TT | Twin Tip Plug | Tightneing Torque (Nm): 22 | 1 - Earthed Electrode | Diameter (mm): 14 | Thread Length (mm): 19
- The Finest Twin Tip plug with improved acceletation, fuel economy and longevity compared to single tip plugs. The quenching effect has been decreased by forming the electrode into a double needle shape. As a result, the flame kernel rapidly develops and the engine’s power is drawn out to its maximum potential. DENSO IRIDIUM TT spark plugs have a φ0.4 mm iridium alloy center electrode and a 0.7 mm needle-type platinum alloy ground electrode.
- The iridium tip is mounted with an “All-around Laser Welding” method that insures high reliability even under the most severe driving conditions.
- Using DENSO’s exclusive iridium alloy having a very high melting point, the tip of the center electrode can be shaped very thin and fine, reducing spark voltage requirements and greatly improving ignitability.
- All specification types include an embedded, highly reliable, monolithic resistor to eliminate electoromagnetic noise interference from all kinds of electronic devices.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00TPUA6I2 |
| Best Sellers Rank | 128,860 in Automotive ( See Top 100 in Automotive ) 654 in Car Spark Plugs |
| Brand Name | Denso |
| Compatible with Vehicle Type | Car, Van |
| Core Material | Iridium |
| Country Of Origin | Japan |
| Customer Reviews | 5.0 5.0 out of 5 stars (11) |
| EU Spare Part Availability Duration | 1 Years |
| Global Trade Identification Number | 00042511047099 |
| Included Components | Iridium TT Spark Plug x1 |
| Item Type Name | Spark Plug |
| Item Weight | 0.07 Kilograms |
| Manufacturer | DENSO Corporation |
| Manufacturer Part Number | IW20TT |
| Manufacturer Warranty Description | 2 Year Manufacturer |
| Thread Size | 14 millimeters |
| Top Material Type | iridium |
| UPC | 042511047099 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Denso
- **Core material:** Iridium
- **Thread size:** 14 millimeters
- **Top material type:** iridium
- **Vehicle service type:** Car, Van

## Images

![Iridium TT Spark Plug - IW20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug Fits Fiat Mercedes-Benz Honda MG Nissan Porsche Renault Subaru VW Hyundai Daewoo Lotus - Image 1](https://m.media-amazon.com/images/I/812UZ3IkwJL.jpg)

## Questions & Answers

**Q: What is the heat range rating on this plug?**
A: Here is a comparable heat range chart: https://www.densoproducts.com/learning-center/article/225/heat-range-conversion-chart, obviously this is a 20 plug.

**Q: Are these denso (4709) iw20tt spark-plugs delivered "pre-gapped" to the customer?**
A: As in any spark plug (SP) user, you should always check the gap. The same SP could be used in different engines and/or applications. So, BE EXTRA CAREFUL GAPPING these SP because the center electrode is .040 in dia. Will snap off very easily. I put them in a vice with vg light and carefully gap to what I need. I use non-nickel anti-seize on the threads whether the heads are aluminum or CI. Torque to factory specs. Good luck

## Customer Reviews

### ⭐⭐⭐⭐⭐ Genuine Denso
*by D***R on 25 July 2025*

Great spark plug, I checked these carefully on receipt to make sure they where genuine (as there are a lot of fakes about).

### ⭐⭐⭐⭐⭐ Review
*by J***E on 25 December 2020*

After using Denso's iridium tt plugs in my truck and van and getting great results. I found a TT plug with the proper reach, thread and heat range for my GeneRac GP5500, Denso (4709) IW20TT Iridium TT. Really easy starting, very stable with varing loads. You will know you are using a TT plug the first instant the engine starts because it sounds slightly different.

### ⭐⭐⭐⭐⭐ Review
*by V***A on 18 August 2024*

Alles wie vom Verkäufer beschrieben und genau so wie erwartet und es mir vorgestellt habe. Beste Empfehlung!

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-09*