---
product_id: 26945025
title: "6637 Gold Air Filter"
brand: "napa"
price: "$307"
currency: NZD
in_stock: true
reviews_count: 8
category: "Napa"
url: https://www.desertcart.nz/products/26945025-6637-gold-air-filter
store_origin: NZ
region: New Zealand
---

# Eco-friendly cellulose media Precision fit 12.38x4.5x12.38 in OEM-grade durability 6637 Gold Air Filter

**Brand:** napa
**Price:** $307
**Availability:** ✅ In Stock

## Summary

> 🛠️ Elevate your engine’s breathability with Napa Gold precision!

## Quick Answers

- **What is this?** 6637 Gold Air Filter by napa
- **How much does it cost?** $307 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/26945025-6637-gold-air-filter)

## Best For

- napa enthusiasts

## Why This Product

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

## Key Features

- • **Trusted NAPA Gold Quality:** Backed by a top-rated brand with 4.7-star reviews and proven durability
- • **Universal Fit, Zero Hassle:** Designed to fit a wide range of equipment with exact dimensions for seamless installation
- • **Premium Cellulose Filtration:** High-quality media traps contaminants, boosting engine longevity and efficiency
- • **Engineered for Peak Performance:** Meets OEM air filter change intervals for reliable engine protection
- • **Upgrade Your Ride’s Breathing:** Enhances airflow for smoother, more powerful engine performance—feel the difference

## Overview

The Napa 6637 Gold Air Filter is a premium, OEM-recommended air filter featuring a durable cellulose media and precise 12.38 x 4.5 x 12.38 inch dimensions. Designed for universal fit across various equipment, it ensures optimal engine protection and improved performance. Trusted by professionals and backed by a 4.7-star rating, this filter offers a cost-effective, high-quality upgrade for enhanced airflow and engine longevity.

## Description

The Napa 6637 Gold Air Filter, manufactured by Wix, is a high-quality, rectangular air filter designed to meet OEM air filter change intervals. This 'Better' grade filter features the Donaldson ECB Series air filter assembly, suitable for various equipment. Made of cellulose material, it has accurate dimensions of 12.38 x 4.5 x 12.38 inches (L x W x H), ensuring a perfect fit. The product's part number is 46637, and it is available in a gold color. This air filter, identified as SKU FIL 6637, is not vehicle-specific and is a non-washable filter. The bottom outside diameter is 8.5 inches, and the bottom inside diameter is 4 inches. The 'NAPA Gold' sub-brand guarantees top-notch quality and performance.

Review: High quality - The Napa 6637 Gold Air Filter is an automotive air filter designed for use in vehicle engines. It is designed to remove contaminants and debris from the air entering the engine, improving the performance and longevity of the engine. The Napa 6637 Gold Air Filter is washable and reusable, making it a cost-effective and environmentally-friendly option. It is also constructed with high-quality materials and features a sturdy, durable design. Overall, the Napa 6637 Gold Air Filter is a reliable and effective choice for automotive air filtration. It offers excellent value for the price, and it is built to last. I would recommend it to anyone in need of an automotive air filter.
Review: Great upgrade - Added this filter to my 2000 7.3 powerstroke diesel and before I had a stock filter and box that was broken. Decided to upgrade to this and well worth the money! My truck builds better boost, makes better power and overall is feels smoother and a tad faster now. Great buy. Trucks breathing like it should!

## Features

- NAPA Gold Filters Are Recommended For OEM Air Filter Change Intervals
- Air Filter Assembly for Various Equipment
- Donaldson ECB Series - Air Filter Assembly for Various Equipment

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00K24KSDS |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #472,579 in Automotive ( See Top 100 in Automotive ) #5,782 in Automotive Replacement Air Filters |
| Brand | NAPA |
| Customer Reviews | 4.7 4.7 out of 5 stars (631) |
| Date First Available | March 22, 2014 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 3.6 pounds |
| Item model number | 6637 |
| Manufacturer | NAPA |
| Manufacturer Part Number | 46637 |
| OEM Part Number | 145898 |
| Product Dimensions | 12.38"L x 4.5"W x 12.38"H |
| Shape | Round |
| Special Features | Bottom I.D. (Inches): 4 in. Bottom I.D. (mm): 102 mm Bottom Inside Diameter: 4 in Bottom O.D. (Inches): 8.5 in. Bottom O.D. (mm): 216 mm Bottom Outside Diameter: 8.5 in Filter Type: Round Height: 12.38 in Height (Inches): 12.38 in. Height (mm): 314 mm Media Material: Cellulose Style: Air Filter Top I.D. (Inches): Closed Top I.D. (mm): Closed Top O.D. (Inches): 8.5 in. Top O.D. (mm): 216 mm Top Out… |
| UPC | 765809166073 |

## Product Details

- **Brand:** NAPA
- **Fit Type:** Universal Fit
- **OEM Part Number:** 145898
- **Product Dimensions:** 12.38"L x 4.5"W x 12.38"H
- **Product Grade:** Better

## Images

![6637 Gold Air Filter - Image 1](https://m.media-amazon.com/images/I/31jLJsTsmBL.jpg)

## Questions & Answers

**Q: Is this carb compliant for smog in california?**
A: Good Morning,
Thank you for contacting us, we cannot guarantee such compliance. and we just don't have that filter in stock, we have now the Fleetguard AH1141 we leave the information according to its attributes so they can compare:
Overall Height: 314.45 mm (12.38 in)
End Connection Height: 35.052 mm (1.38 in)
Largest housing OD: 215.9 mm (8.5 in)
End Connection ID: 101.6 mm (4 in)
Primary Applications
CUMMINS: 3912020
DONALDSON: B085011
Thank you, we hope the information has been helpful. Any questions or additional information you need, we are at your service.

**Q: Is this the same filter as a Donaldson 6637 filter?**
A: The Donaldson equivalent to a Napa 6637 is Donaldson B085011

**Q: What do I need to bolt in a 1997 f250 7.3?**
A: all you need is a 4"to 4" exhaust adaptor from your local Napa,fleet farm whatever. remove stock air box, zip tie senser, use stock clamp from stock rubber tube and find a 4.5 inch clamp for the filter or do what I did on the last 4- 7.3s I've done and use elec. tape to seal filter to pipe. take yer time make it look good and its good to go

**Q: What do I need to bolt in a 1997 f250 7.3?**
A: You need a 45° PVC elbow, 4" diameter, and 2 big hose clamps.
And remove your old air box, all of it.

## Customer Reviews

### ⭐⭐⭐⭐⭐ High quality
*by T***. on December 15, 2022*

The Napa 6637 Gold Air Filter is an automotive air filter designed for use in vehicle engines. It is designed to remove contaminants and debris from the air entering the engine, improving the performance and longevity of the engine. The Napa 6637 Gold Air Filter is washable and reusable, making it a cost-effective and environmentally-friendly option. It is also constructed with high-quality materials and features a sturdy, durable design. Overall, the Napa 6637 Gold Air Filter is a reliable and effective choice for automotive air filtration. It offers excellent value for the price, and it is built to last. I would recommend it to anyone in need of an automotive air filter.

### ⭐⭐⭐⭐⭐ Great upgrade
*by T***D on April 2, 2020*

Added this filter to my 2000 7.3 powerstroke diesel and before I had a stock filter and box that was broken. Decided to upgrade to this and well worth the money! My truck builds better boost, makes better power and overall is feels smoother and a tad faster now. Great buy. Trucks breathing like it should!

### ⭐⭐⭐⭐⭐ Quality
*by A***R on August 4, 2025*

Proper fit. Long lasting

## Frequently Bought Together

- Napa 6637 Gold Air Filter
- Air Pre-Filter Preclean Sleeve for Napa 6637 Donaldson B085011 Baldwin PA2818 Fleetguard AH1141 Fram CA6818 Wix 46637 Filter, White
- Spectre Performance 9709 4" Straight Aluminum Intake Tube,Silver

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-20*