i have a k&n filter charger on my 87 na. i hooks right up to the stock air intake piping (the plastic crap) but i've seen guys use injen technologies cool air intake piping for early 90's integras w/ the k&n filter charger (see racing beat) and they work great. also, as far as making a box or heat sheild, you've prbably got what it takes to make a functional and presentable one in your garage. good luck bro.
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