Car- Mercedes C55 AMG 2006
Subwoofers - 2 Dayton Audio MKIII 10s
Amp - Kicker SX650.1
Box Volume - 2.54cuft
The box has a single 4" aero port and its tuned to 28hz. The box was to shallow for the correct port length so it has a 90 in the back to get the full length.
Heres a pic of the WINisd graph
The F3 is 26.9hz and it stays extremely flat, very happy with the curve.
Heres some pics...