Been talking to bigblock427 on some stereo options and trying to figure out how to utilize the stock subwoofer area to accomidate a larger sub. i know in the past id maken two sets of O-rings and simply glue them together. one to fit lets say a 6.5" hole with a 8" adapter for a higher quality mid without fiberglassing. So long story short he sent me some links i thought would be useful and being as i have google chrome i figured they would be helpful to translate and show everyone else for whoever was wondering EXACTLY what is in the car and mounting depth of the stock sub to calculate what you will have to do to fit a larger deeper (sounds kinky

) subwoofer in that location. This is what i gathered and it is just copied and pasted from the german crossfire forum.
Carhifi in Crossfire
Hello, in this post I would like to inform you about the hi-fi system in the Chrysler Crossfire and share my experiences on the subject. first Documentation of the Infinity system Factory
N & A and SRT-6: Either Infinity CD radio (Becker), and Infinity CD navigation radio (Becker)
Trim Blackline: Infinity CD radio (Becker) without additional amplifier and Infinity 6.5 "(16.5 cm) subwoofer in the rear bulkhead.
Trim Silver Line: Alpine 1 "navigation system with retractable screen and Infinity Package
The Infinity System consists of:
2 x 6.5 "(165 mm) woofers in the doors (Nominal Impedance: 4 Ohm Measured,: 3 ohm)
2 x 6.5 "(165 mm) subwoofer in the rear bulkhead (double spooler, Nominal Impedance: 4 ohms per coil Measured, 2.7 ohm)
2 x 16 mm tweeter in the doors, cut off with a simple capacitor (6 dB / octave)
Infinity amplifier. 6 x 22 watts RMS into 4 ohms, Sharc processor with integrated subwoofer for crossover, time alignment and equalization for the subwoofer for the entire system. 4 x 22 watts going to the subwoofer (double spooler), 2 x 22 watts going to the front system.
Coupe: in the rear window antenna, antenna amplifier in the tailgate
Roadster: Rod antenna with antenna amplifier
With GPS navigation system mouse underneath the dashboard on the right side
also attached a picture from there site. I DID NOT TAKE IT. of the stock sub and the enclosure it goes into the get a better idea with some dimensions on it.
Hope this helps everyone as much as it helped me!