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NOS In-Line Hi-Flow Nitrous Filter, 4AN - Blue

High pressure nitrous filter, -4AN x -4AN in-line billet aluminum (140 micron)

PART# 15551NOS

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$42.22   Suggested Retail
$38.00   Your Price
Estimated shipping date: 11/06/2020
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One of the most important components of any nitrous system is a good filter. NOS filters feature an aircraft-type reusable stainless steel mesh filter element to keep contaminants from attacking a solenoid and plugging the jets. These new NOS hi-flow billet aluminum filters feature a precision 2024 billet aluminum body and a 140-micron serviceable stainless steel mesh filter element that has 10 times the filtering area of a standard filter. Our filters feature a radius on the outlet fitting to maximize flow and are available in a variety of sizes depending on your needs.


  • Constructed of 2024 Aluminum for Strength and Durability
  • Anodized Finish for Great Looks
  • 140-micron Filter Element
  • Easy to clean
  • Reusable Stainless Steel Mesh Filter
  • Male AN Fittings on Inlet and Outlet
  • Radius on Outlet Fitting to Maximize Flow
  • Compact Design to Minimize Weight Without Restricting Flow
  • Overall length - -4AN & -6AN Filter 4-1/8” and -8AN Filter 4-3/8”


Emission Code4
Filter Screen IncludedYes
Fitting AttachmentMale Threads
Length4-1/8 inch
Product TypeNitrous Filter
Part Number15551NOS



This part is legal for sale or use on Racing Use Only Vehicles

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

Tech Resources

It is an excellent idea to check your nitrous filter periodically and clean if necessary.
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