McMaster Carr has 5"ID flex hose... but i'd recomend doing it in PVC or thinwall PVC. flex hose as a huge static pressure drop so if you have a longer run, the volume and velocity of air will be cut down
Thanks guys was gonna use a piece of 5'' exhaust pipe and bolt it down to the top of the carb then just run the hose back threw the fire wall. Dunno if i need 5'' It's for a 383 stroke i just wanna try to get as much air to it as possible so i don't gotta worry about choking the motor down just a temporary thing till i get time to build a box for it.
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