If the pit calculator told you to use 6" pipe that's about 28 sq. inches. Your two 3.5" pipes are around 18 sq. inches. You need a bit more than 1 more 3.5" pipe 36" long. Might go with 4" to offset the 25" long one.
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Joe
Falcon MK V gaseous grill w/Grill Grates, OK Joe Longhorn w/ vertical - now gone, Char Griller Akorn, Camp Chef PG24SG, Weber 22" OTG w/SNS components
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