K&N to GSL-SE Project


Well, I got tired of waiting for K&N or HKS to release an airbox replacement for the GSL-SE, so I made my own (It's easy to do). I started with the K&N filtercharger, but a HKS SuperPowerFlow would work just as well.

First you'll need to make an adapter plate. Why? Because the 2nd gen cars (that the K&N replacement is made for) have a wider airflow meter (AFM) intake. The adapter plate goes between the base of the K&N and the airflow meter on the GSL-SE, thus making up for the size difference.

I built my adapter plate out of 1/16" aluminum plating. I had the plate cut and then used a dremel tool and drill bits to finish it up. If you don't feel comfortable making your own plate, you can have a local machine shop make one for you. All of the measurements on the diagram are in millimeters (mm) and the 4 drilled holes have a 7mm diameter.

Here's what the plate should end up looking like:

You can click the image for the fullsize drawing, or you can download it by clicking your preferred format below:


Once you get the plate made, you can follow the installation instructions for the K&N or HKS filter. Basically, you remove the stock airbox and bolt the filter base to it (the supplied hardware works just fine). You may want to put a very small amount of silicone sealant on both sides of the adapter plate to make sure you get a good seal.

By far, the hardest part of this mod is making the brackets to hold the filter in place. I used a vice, hacksaw, large hammer, swear-words, etc. to modify the supplied brackets to work in the GSL-SE. It was time consuming, but worked out great. You might also try making your own brackets from scratch.

I also removed the ducting that ran across the grill to the stock airbox. Removing the duct lets the K&N get quite a bit more fresh air. I may eventually fabricate some sort of fresh air piping to it, but it will probably be a while, as the temps around the filter are staying quite low. Also, I've been running this setup for several months now with no ill-effects.

I could tell a slight improvement in acceleration from the mod... and it looks neat. What more can you ask for?

Here are a few pics of the finished project (please excuse the dirty engine compartment... I didn't have time to clean it up before taking pics). Just click on the image for the full size pic.

This is a disclaimer... can't you tell from the small font size? Anyway, if you perform this modification, you do so of your own free will and agree not to hold me responsible if you or your car come to harm before, during, or after performing the aforementioned modification.

Back to the Main Page