most guys over here go a OTR or MCAI with 2 hole mod
I dont know if the GTO has the shroud on the front of the air box standard or not but that is what we call a MCAI (monaro CAI)
and we do a 2 hole mod on the bottom half of the air box
here is a link to a DIY
My CAI mod on my VY SS ute (series 1)
very cheap mod with good gains
add a K&N filter and it is a all good
I would do this over the K&N pod filters
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222/224,918,OTR,25% UDP,ported TB,4 into 1's 1 5/8,3"cats,twin 3" X force,ripshift(race)12.7@113,271.5rwkw,364rwhp
