My afternoon attempt one sunny day to unsuccessfully mate a pod filter to my S13's AFM didnt end up completely fruitless. After inspecting my stock airbox I discovered some dodgy stuff going on which I spent the rest of the arvo rectifying.

First of all the air box was missing the stock cold air intake duct which was resulting in the airbox sucking in very hot air from the engine bay. Finding my old CA18DE pipe and with some skillful use of the stanley knife, I modified the old DE one to fit the DET.

The resonator was also missing off my stock airbox which was causing my airbox to suck air in through the resonator hole, missing the filter element all together!! Luckily again I had my old DE one which went straight on. The airbox was half cabled tied on to begin with, so missing most of the original bolts I cabled tied everything back together nice and snug.

The Results!

Now considering the airbox was sucking air straight through the empty resonator hole, missing the filter paper altogether, the original setup was acting sort of like a pod. With the stock resonator and stock cold air intake pipe back on the results were suprising! Despite being a lot more smoother in acceleration, I found that the engine was a lot more responsive low down. In collaboration with other NissanS13 members, I found other people had experienced this too:

I totally agree with your results, and have tried to push this point across many a times, but alot of people just like the noise factor.

I've had the pod, and air box, and modified air box's, etc... and for my situation, what I have done, is the best in my opinion.. I've used the standard box, with resonator (I beleive there is actually quite a bit about resonator tuning for getting good acceleration curves) and setup my own cold air into to the box, with a HKS high flow panel filter.

When I had the pod, not only was it loud, but it didn't seem as responsive down low, and as smooth, as with the air box.

Now this may be a completely different matter for non-turbo cars as their induction is of a completely different nature (they like to suck - not blow ;) but for the moment im going to leave my stock airbox as is - and maybe just throw in a aftermarket panel filter as described above. For anyone wanting to buy a pod filter however, the pod pictured above is a brand new Samota pod filter which I got at a local auto parts shop for under $40 - great value in my opinion.

For those installing a pod filter and need to make up an adaptor, if you are prepared to butcher your old airbox, there is actually a brass plate which would make a great adaptor already inside the stock airbox! Take a look in your stock airbox and you'll see what I mean.

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