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Spectre 3991

Breather Filter
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5.0 out of 5 stars 2 Customer Reviews
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$10.49 USD
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This Spectre breather filter, also known as a crankcase vent filter, has a flange with an inside diameter of 10mm. By using the included adjustable worm gear clamp, this air filter will fit tubes with outside diameters from 3/8 inch to 1/2 inch (8-12mm). Spectre breathers use pre-dyed synthetic media for lasting color, feature a triple chrome-plated steel top and base, and come factory pre-oiled and ready to use.
  • Triple chrome-plated steel top and base
  • Made with pre-dyed synthetic media for lasting color
  • Includes a stainless steel adjustable clamp
  • 10 mm flange inside diameter
  • Fits 3/8 inch to 1/2 inch (8-12mm) tubes
  • Offered with black, red, blue, or white media

Part SPE-3991 Product Specifications

Flange Inside Diameter0.375 in (10 mm)
Height1.75 in (44 mm)
Outside Diameter2 in (51 mm)
Top MaterialChrome
Top StyleMetal
Air Filter ColorBlack
Filter MaterialNon-woven Synthetic
Product StyleSpectre Breather Air Filter
Flange Length0.75 in (19 mm)
Weight0.2 lb (0.1 kg)
Product Box Height2.25 in (57 mm)
Product Box Length6 in (152 mm)
Product Box Width4 in (102 mm)

Product Reviews

April 24, 2017 - Part 3991
Used to protect intake from sucking in motor oil via PCV. Paid like $12 and took 30 min or so to make it fit but final product was more than worth it. Looks great, preforms well, and just plain does what it's supposed to. This is the second product I've purchased from Spectre and it definitely won't be the last.

November 3, 2014 - Part 3991
This is a great breather. Hard to find in Chrome.

Review part 3991