The K&N 66-1101 is an 11-inch round X-Stream top that replaces the metal lid on an existing round air filter assembly, so it is not a complete filter on its own. The manufacturer describes it as a black powder-coated top with a cotton gauze filter built in, adding filter area while feeding the engine more air. Because the element is washable and reusable, a buyer avoids repeatedly purchasing disposable paper filters. The manufacturer rates it at up to 99% efficiency and backs it with a one-year limited warranty, so the flow gain does not come from giving up filtration.
Fitment is the key question for this part. The manufacturer's install sheet shows the top being held down by a 1/4-20 all-thread stud threaded into a carburetor or throttle body, and that stud must be sourced locally and trimmed to length. Confirm that your base plate and stud position match before ordering. Tuners searching for an 11 inch K&N X-Stream air cleaner lid, reusable cotton gauze top for round carb intakes, or 66-1101 replacement filter top will find the specs below useful for checking compatibility.
No. According to the manufacturer, the X-Stream top replaces the top of your existing round filter, so you still need the base and filter element that your setup already uses.
The manufacturer states that its universal X-Stream filters are legal only for racing vehicles and are not intended for emission-controlled street or highway vehicles. Buyers should review that statement before installing it on a street car.
The manufacturer's install sheet calls for a 1/4-20 all-thread stud, a jam nut, a nylock nut, and a rubber washer and metal washer, plus K&N sealing grease between the filter charger and the top and base.
Per the manufacturer's install sheet for the 66-1101, the job centers on a stud threaded into the carburetor or throttle body. You thread the stud down until it bottoms out, mark it at 1/2 inch, cut it, and deburr the end. A jam nut then locks the stud in place, and you reinstall the base, filter, and top so the stud protrudes 1/2 inch through the top. The nylock nut is set to leave about 1 inch of stud above it with the washer installed, which provides roughly 1/8 inch of preload on the top. The manufacturer warns that more preload can damage the top, so tighten only until the top bottoms out on the small washer and at least two threads show through the nut. Use K&N sealing grease so the filter charger seals properly. The manufacturer lists a 60-minute install time and a wrench as the tool needed.
