so i have my maw 15 in a sealed box 2.7cuft and was wanting to port it this is the largest box i can fit in my reg cab pickup does anyone no what size port to sue thanx in advance

4" might just make it for you, just make sure if you use elbows, you use a pair of 45 degree elbows instead of a single 90 degree, to try to keep airflow smoother.

4" might just make it for you, just make sure if you use elbows, you use a pair of 45 degree elbows instead of a single 90 degree, to try to keep airflow smoother.

Do you by chance know how long it should be? thanx for your help

According to this calculator: http://www.carstereo.com/help2/Articles.cfm?id=31

Tuning the box to 33hz,

a 4" port should be 8" long

a 5" port should be 14" long

Go with the 5" if you can.