The K&N 33-2011 is a reusable, drop-in replacement element for the factory air box on the Jaguar XJS V12. The manufacturer describes it as a high-flow, lifetime filter designed to raise airflow while keeping the filtration that protects engine life. The buying case is repeat cost and airflow: you clean and reuse the element at service intervals instead of buying a disposable filter each time, and it sits in the stock housing, so the factory intake layout stays intact. It also carries the manufacturer's Million Mile Limited Warranty, which suits owners who plan to keep a classic Jaguar for years.
Confirm fitment before you order. The manufacturer lists this element for the fuel-injected 5.3L V12 XJS from 1975 through 1993, but other sources show different model years and engines, so check the listing against your VIN and engine code. Owners on user forums describe the V12 air box as straightforward to service, while the six-cylinder boxes are fiddlier. Per the manufacturer's install sheet, the filter is a direct replacement with no modification required, so the job is a matter of swapping the element and sealing the lid properly. Search terms owners use include K&N 33-2011 XJS V12 drop-in filter, reusable Jaguar 5.3 V12 air filter, and XJS air box filter replacement.
The manufacturer lists it for the fuel-injected 5.3L V12 XJS from 1975 through 1993. Other sources give different years and engines, so confirm your model year and engine code with the manufacturer before ordering.
No. The manufacturer's install sheet describes it as a direct replacement for the stock air filter, with no modification required.
Yes. The manufacturer says the install steps must be followed every time the filter is serviced, because otherwise the filter may not seal properly and engine damage can result.
This is a manageable DIY job on the V12 air box. Per the manufacturer's install sheet, remove the old filter from the air box, clean all sealing surfaces of dust and debris, and seat the K&N with the "This side up" engraving facing up into the box. Close and fasten the lid, then clean an area on the air box and apply the K&N stop decal as a service reminder. Owners on user forums note that the six-cylinder box requires loosening the inlet clamp, releasing the clips to the airflow meter, and removing wingnuts from the inner wing, and they warn that the rubber mounts can tear if you pull too hard. Basic hand tools are enough for the V12 box.
