The AEM Induction 1-4002 is a black, round-tapered pre-filter wrap that fits over a Dryflow air filter element. The manufacturer makes it from a durable micro-screen material and pretreated with a proprietary hydrophobic process designed to prevent splashes of water or mud from saturating your Dryflow air filter. For a buyer chasing reliable low-restriction intake airflow in water crossings, mud runs, or wet weather, that sacrificial outer layer protects the filter element itself.
The main reason to choose it over a bare filter or a cheap generic sock is that it adds protection without choking airflow. The manufacturer says the wrap also stop small dirt particles; yet add little restriction. Owners on user forums describe Dryflow-style elements as reusable and long-lasting, which makes a dedicated wrap a practical way to extend the time between filter cleans or replacements. Look for AEM Induction Dryflow prefilter, 1-4002 dry air filter wrap, and water and mud intake protection when searching for this part.
The manufacturer states the wrap adds very little air restriction while blocking small dirt particles, and it is designed to keep water and mud from saturating the Dryflow element underneath.
The manufacturer's cleaning steps are written for the Dryflow element: tap off loose debris, apply Dryflow cleaner or a mild multipurpose cleaner to both sides, rinse from the clean side out, and reinstall once the filter is dry or only slightly damp. The manufacturer also says not to apply oil to a Dryflow filter. Confirm with the manufacturer whether the wrap should come off for cleaning.
No. The manufacturer lists it as a pre-filter that works over a Dryflow air filter, so the filter element still does the primary filtering.
The wrap is a slip-on part, so the job is typically removing the Dryflow element, sliding the wrap over it, and reinstalling. The manufacturer's intake install sheets have you push the filter onto the inlet pipe and not completely tighten the hose clamps or mounting hardware until instructed to do so. Owners on user forums report that some aftermarket panel filters run thicker than a stock filter, and would not fit without some cutting. Measure airbox clearance with the wrap installed before you close everything up. Owners also report that a filter that doesn't seal well would not seal properly with the stock clips, so confirm the airbox lid closes and locks fully.
