That old write up on how to cut up an AEM CAI was for an older version they don't sell anymore. The problem with your setup is the throttle body will be to high for a GS-R AEM, but you might be able to make it work. I'd suggest you pickup a '99+ Si or '94+ Del Sol VTEC AEM CAI that will fit properly and use the stock resonator hole rather than making that 90 degree bend to get under the frame rail.
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Andy - Reinstated
Hybrid Forum Moderator
'06 Subaru Legacy Spec B - Stock, for now
'98 Civic EX - CTR headlights and grill, Kosei K1's, for sale
'90 240SX - SR20DET that will never get installed, project car.