well - here's the specs from Blueprint on their recommendation for a car setup...
BluePrint Drivers
1001 Car Application
Suggestions
Small sealed enclosures: 14 liters (.5 cuft) with light stuffing. Excellent for SQ applications.
Ported enclosures: they are rather difficult to construct using this driver due to port lengths and air speed in the ports. We have had good results with 42 liters (1.5 cuft) tuned to 30 Hz with a 3" diameter X 11" long port. Excellent for lower powered applications.
