..Ok, so I have the stock intake arm on my 93 LX. It it the huge black tube that is ugly as all hell. I took it off earlier only to find that theres about a 1" and a half hole for airflow when the intake is like 4 inches around. I was told to use PVC pipe instead for better airflow and purchase a K&N filter for it. Should I use the PVC pipe idea? If so, how big of pipe will I need? I'm thinking 2 and a half inch pipe.