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According to road and track the GTO has a 100mm throttle body.... some how I really doubt that
Well they say intake opening. A stock LS1/LS6 TB is 75, BBK is 80 with a reducer plate...there is a 90mm LSX intake coming out ....

Well they say intake opening. A stock LS1/LS6 TB is 75, BBK is 80 with a reducer plate...there is a 90mm LSX intake coming out ....