kurquhart - Thanks dude! Yeah, I did a sound level reading without the interior, and it was peaking at something like 80dB while cruising on a highway. I definitely need earplugs for long drives...
Oh, and I am intentionally ignoring your question about the sunroof
geordie - It was a custom designed/built exhaust with unequal length headers, going into two Magnaflow mufflers which are joined by cross flow pipes. I'll try to remember and take photos later when I drop by the shop. The guy who designed the system spent a lot of time studying airflow out of a 3.6l engine and how to best move the exhaust gases out while retaining correct backpressure to create maximum power gains.
The Cup Is I have are 7" up front and 8" in the rear.