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09-30-2019, 08:44 AM
slowbird
Ultimate Warrior
Join Date: Jan 2001
Location: Montgomery, IL
Posts: 10,657
That graph os useless in my opinion. If you follow that graph then ci and rpm jave nothing to do with exhaust size. According to that graph our GTO should be running roughly 1 3/4" headers, the car was 2tenths slower with that size header vs 2".
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