Outerwear Pre-Filter, 3.5 To 3 3 Taper, 4 Tall, Black

OVERVIEW

When you''re tearing through the dunes or pushing your air-cooled beast through a dusty trail, the last thing you want is for your engine to ingest fine sand and silt that can act like liquid sandpaper on your cylinders and rings. This Outerwears Pre-Filter is the professional-grade solution for off-road enthusiasts who demand the highest level of protection without sacrificing the airflow necessary for peak performance. Engineered specifically to fit tapered air filters, this black pre-filter acts as a primary barrier, capturing up to 90 percent of the debris that would otherwise clog your primary filter element. By stopping the big stuffand even the micro-fine dustbefore it reaches the pleats of your main filter, you ensure that your Volkswagen''s engine breathes clean air even in the harshest conditions found at Glamis, Ocotillo Wells, or your local off-road park.

Crafted by the industry leaders at Outerwears, this pre-filter is designed with a specialized polyester mesh that features uniform micron-sized openings. This unique material is treated with a hydrophobic process, meaning it doesn''t just stop dirt; it actually helps repel water and moisture, preventing your filter from becoming a soggy mess during unexpected rain or muddy crossings. For the VW owner running a Weber Progressive, DGV, or DFEV carburetor setup, this is a mandatory upgrade for longevity. It is incredibly easy to install and even easier to maintain, allowing you to spend more time behind the wheel and less time cleaning your primary filter. Whether you are running a show-quality Beetle or a rugged long-travel sand rail, the sleek black finish provides a clean, professional look that complements any engine bay while providing the peace of mind that only genuine Outerwears protection can offer.

FITMENT

This tapered pre-filter is designed for a wide range of air-cooled applications and universal high-performance air filters commonly used in the following vehicles:

• Volkswagen Beetle (All Years): Perfect for Baja Bugs and street cars running aftermarket air cleaners.
• Volkswagen Karmann Ghia: Fits tapered performance filters on upgraded carburetor setups.
• Volkswagen Bus / Type 2: Ideal for Type 4 engine conversions or upright configurations with tapered filters.
• Volkswagen Thing (Type 181): Provides essential protection for trekking through dusty environments.
• Dune Buggies and Sand Rails: A staple for any open-engine rail running Weber or Dellorto carburetors.
• Carburetor Compatibility: Fits many filters associated with Weber 32/36 DGV, 38 DGAS, and various IDF velocity stack filters depending on dimensions.
• Universal Application: Any air filter with a 3.5-inch base and a 3-inch top taper.

SPECS

Every Outerwears pre-filter is built to exacting standards to ensure a perfect fit and maximum filtration efficiency. Here are the technical specifications for this unit:

• Part Number: 115-10-4TBK
• Base Diameter: 3.5 Inches
• Top Diameter: 3.0 Inches (Tapered Design)
• Height: 4.0 Inches
• Color: High-Gloss Black
• Material: UV-Resistant Industrial Grade Polyester Mesh
• Filtration: Stops particles down to .005 inches
• Treatment: Hydrophobic (Water Repellent) finish
• Operating Temperature: Stable in high-heat engine compartments

PRO TIPS

1. Proper Cleaning for Longevity

Never use harsh solvents or pressurized air to clean your Outerwears pre-filter, as this can damage the specialized mesh and strip the hydrophobic treatment. Instead, simply remove the pre-filter and wash it in a bucket of warm water mixed with a mild liquid dish soap. Gently agitate the material to release the trapped dust and sand. Rinse thoroughly with cool water and let it air dry completely before re-installing. This simple maintenance routine can extend the life of your pre-filter for years and ensures your engine doesn''t suffer from restricted airflow due to a loaded-up mesh.

2. Check for Clearance and Rubbing

While the Outerwears material is incredibly durable, it is not immune to friction. When installing this on your VW, ensure that the pre-filter does not rub against any throttle linkages, fuel lines, or the underside of the decklid. Constant vibration during off-road use can cause the mesh to wear through if it is touching a hard surface or a moving part. If space is tight in your engine bay, you can slightly rotate the filter or adjust the mounting angle to ensure the black mesh remains unencumbered and free to breathe from all sides.

3. The Dry Installation Rule

A common mistake is treating an Outerwears pre-filter like a standard gauze filter and applying oil to it. You must NEVER apply filter oil to an Outerwears pre-filter. These are designed to run completely dry. The mesh works through surface tension and specialized weave patterns to deflect dirt. Adding oil will cause the mesh to clog instantly, attracting more dust and turning it into a thick paste that will choke your engine. Keep it clean, keep it dry, and let the engineered polyester do the heavy lifting for your air-cooled flat-four.