Had a '04 Touring 6MT Superblack/Burnt Orange w/ Bose sound, back when I was in college. Only mods were AAM Plenum spacer, custom short ram intake w/ K&N, clear reflectors and Hawk HPS pads.
Loved that car, have to say the stock clutch pedal + master cyl + slave cyl setup on that car is/was 100x's better than the stock setup + CSC nonsense on the 370Z. Stock exhaust note is hands down, far and away better on the 350Z then the 370Z. the 350Z might be one of the best, most unique exhaust notes of any car I've ever heard. While the stock exhaust on my 2010 Nismo 370Z, on the other hand, sounds like a V6 Honda Accord.
I guess I was either just lucky, or extra careful, but I never had too bad of an issue with my 350 interior scratching. I was(/still am) very meticulous about my car and who I let in it though.