yes the GTs have a 80mm I dont remember what the maf is on the 94-95 being a last gen 5.0 but the 96+mod motors are 80mm and they might have made them bigger in 02 or 03 not sure
as for dyno tuning
well on avg. it cost 350 for a base dyno tune depending on where you go but a lot of places charge 250-350 for the chip and then 100 per hr to tune it
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RUN IT STAIGHT AND RUN IT HARD
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Novi 2000
60' 1.46
1/4 10.67
mph 126.5
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