Whats the correct size for the aem-21-813c?

If you go to AEMs site, then look up your intake, it'll show you the replacement filter and based on the size, it should be the 1-4007. I highly recommend the pre filters, keeps the filter clean for a long time.

will this fit my aem intake for a 2002 f150 5.4 engine with a dryflow filter?

well for one thing is your filter a stock screen type of filter or did you get a cold air intake that'll use a canister type of filter? you'll have to reference AEM website in short.

Will this fit a filter that is 6.3" long and 5.9" at the base?

The AEM 1-4001 Dry Flow Air Filter Wrap measures 6" BASE, 5-1/4" TOP, 9" TALL.

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1-4001 Dry Flow Air Filter Wrap

Product ID: 257398731

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Details

Product grade
Replacement
Brand
AEM
Fit type
Universal Fit
OEM part number
1-4001
Global Trade Identification Number

💧Water & mud protection

🌬️Minimal air restriction

🛡️Blocks fine dirt particles

Description

🛡️ Protect your airflow, power your drive!

FEATHERLIGHT BUILD - Weighs just 22.7g, ensuring no added bulk or drag
BREATHE EASY DESIGN - Adds negligible air restriction for peak engine efficiency
SLEEK BRUSHED FINISH - Combines durability with a professional, polished look
PRECISION DIRT BARRIER - Blocks even the smallest dirt particles to keep performance pristine
ULTIMATE ELEMENT SHIELD - Defends your air filter from water and mud intrusion

The AEM 1-4001 Dry Flow Air Filter Wrap is a lightweight, durable accessory designed to shield your dry flow air filter from water, mud, and fine dirt particles while maintaining optimal airflow with minimal restriction. Its sleek brushed exterior and precision fit make it an essential upgrade for performance-focused drivers.

Specifications

Manufacturer	AEM
Brand	AEM
Model	AEM-1-4001
Product Dimensions	15.75 x 12.19 x 2.54 cm; 22.68 g
Item model number	767377
Exterior	Brushed
Manufacturer Part Number	AEM 1-4001
OEM Part Number	1-4001
Item Weight	22.7 g

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