04 360 stereo upgrade

Im meeting with a customer next week who has a few ferraris. The one I have a question about is a 04 360. I dont know what is special about it, but he said it was one of 25. He also has a 360 F1, and I know its different. The front doors have a 61/2 w/ 3" of depth w/ a 1" tweeter up top. So Ive got that figured out as well as the plain DIN size radio. My question is what are my sub options. Ive seen subs in the trunk before at shows, but I havent listen to one. Ive also seen in a magazine one w/ a sub in the back behind the seat. Do any of you guys have or heard subs in one, and what were your impressions. Thanks for your help!
Chad
Encore Car Stereo
Albemarle NC 28001
(704) 986-0262

 

Anyone, anyone, anyone, Beuller, anyone. Pics would even be nice.