our 4" single system increased the exhaust flow to 481 cfm at 10" of water from the factory 3-1/2" exhaust with 305 cfm at 10" of water.
Heartthrob Exhaust Inc.
60819 U.S. Hwy. 12 West
Litchfield, MN 55355
P: 320-693-0222
F: 320-693-8964
email: mike@heartthrobexhaust.com