Its 1/8th inch stainless steel except for the flanges which are 1/16th stainless cut into 1" strips and rolled into a circular shape 2 1/8 in diameter
Regret is that I did the two outlet holes 2 1/8th and the inlet. 2 1/8 isn't a common size for K&N filters. Not nearly as popular as the 3" or larger.
Measures 4"x4" at the inlet and 4"x6" at the dual outlet. 6" Long
Plan is to use it with a mass air setup. Probably just make a new one fit to size when I get the mass air meter.