Can you please expound on the 6 1/2 adapter?
I have Cerwin-Vega HED 1683's all around. They dropped right in, they sound quite good, but I've been thinking about something with a little more oomph, maybe 6 1/2's ??

1999 Silver SE, MTX K+N, Magnecor 8mm Brullen Y-Pipe BAT struts and brakes Sony X-Plode, Cerwin-Vega Some little stuff (tint, cupholder, cargo net, etc.)