The K&N E-2400 is a round, drop-in replacement element for the MGB's factory air box. The manufacturer describes its build as four layers of oiled cotton gauze, designed to trap harmful contaminants while keeping airflow high. Because the element is washable and reusable rather than disposable, the manufacturer says it is engineered to last the life of the vehicle. It is rated for up to 99% filtration efficiency and is designed to increase horsepower and acceleration.
The value against a paper element is lifetime cost. Instead of buying a new filter at every service, you clean and re-oil this one. The manufacturer indicates cleaning roughly every 75,000 miles of normal highway driving, and its cleaning sheet notes that frequent re-oiling may be needed in heavy dust, which makes it a practical choice for dusty backroad or club-event use. Searches like "reusable MGB 1800 air filter," "1970-1974 MGB K&N drop-in," and "washable round carb air filter MGB" describe what this part delivers.
Confirm fitment before ordering. The manufacturer's listing names MG MGB MKII and GT models from 1970 to 1974, while broader Rover MGB 1800 and CARB-GT application ranges appear elsewhere, so details vary. Verify your year and submodel with the manufacturer. Installation is a drop-in swap: remove the stock element, seat the K&N in the air box, and check the seal. Cleaning uses K&N's spray-soak-rinse method, air drying without compressed air, and re-oiling before the filter goes back in.
The manufacturer's listing shows MG MGB MKII and GT models from 1970 to 1974. Application ranges vary across sources, including broader Rover MGB 1800 and CARB-GT references, so confirm your car's year and submodel with the manufacturer before ordering.
The manufacturer indicates cleaning about every 75,000 miles under normal highway driving, with more frequent re-oiling possible in heavy dust. Per its instructions, apply K&N filter cleaner to both sides, let it soak about 10 minutes, rinse with low-pressure water from the clean side toward the dirty side, and let the element air-dry. Do not use compressed air or heat.
Yes. The manufacturer says never to run a K&N filter without oil and to re-oil after every cleaning, applying oil until the entire element shows an even red color. The manufacturer's re-oiling amount for this element is 0.64 oz (19 ml).
The manufacturer describes most applications as a simple swap: remove the disposable element and fit the K&N in its place, following the instruction sheet included with the filter. Check that the seal seats fully in the air box, because the manufacturer warns that skipping its installation steps can produce an improper seal. Oil the element and let the oil settle before installing it, and avoid over-oiling. The manufacturer's tool list for this application was not confirmed in research, so check the included instruction sheet before starting.
