aero ports

[Joseph M 10+ year member]

how many of these should i get for a 18'' btl tuned to about 33??? http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=260-401

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None

Get 2-3 of these:

http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=268-354

6cu and 2 of these full length is around 33-34hz