If I am not mistaken, you do not have a temp sensor on the 93.5 G20. Only the '94 and newer engines have the temp sensor on the factory air box that you have to retro fit onto the K&N cone filter.
Look in the picture below of an SE-R. You will see where the smaller breather filter goes by looking in the lower right hand corner of the screen.
I found that picture on the SE-R.net under multimedia.
You probably had a hose that was connected to the AIV and to the air box that you removed when you took the air box out. The small filter goes where the hose was connected.
This is quoted from the SE-R.net on installation of the breather filter:
Quote:
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On SR20DEs from 91-93 you also need a small filter for the AIV (Air Induction Valve) to stay smog legal. The AIV is there to dump more air into the cat to keep it lit on idle and decel, by removing the OE air box you will now hear the reed inside the AIV canister. It makes a "spitting raspberrys" sound at idle and decel, it is completely normal, you never heard it before because the OE air box muffles this sound. In 94 and 95+ the AIV should be gone as Nissan improved the engine program enough that the ECU can control the engine well enough not to need the extra air (by fiddling with the mixture and timing).
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Hope that helps. If not go to
www.se-r.net and do some research.