https://static.summitracing.com/global/images/chartsguides/t/tfs-6141t784-c00.pdf
ft Value
Intake Flow CFM / Exhaust Flow CFM
.100" 66 54
.200" 134 121
.300" 200 181
.400" 248 213
.500" 281 231
.600" 293 237
.700" 301 240
Tests conducted at 28" of water (pressure).
Bore size: 4.000"; exhaust with 1-7⁄8" pipe
Note bore and exhaust pipe size