[12second350Z]

Hey whats up guys...i havent posted here in awhile ive been so busy with work and school but lately ive been having a problem with my S2k. Its a 2000 with 61,000 miles, i regularly change the oil and tranny fluids. Nothing else has ever really been wrong with the car but the last week ive been noticing this smell. Its kinda hard to explain is not fuel or exhaust fumes or anything, the only other times i have smelled it was when ive dropped the clutch or am really drivin the car hard. I havent really noticed anything else but this damn smell, its almost like something burning but not really. So i think it might be coming from the clutch? But im not sure....if anybody knows what this is or has had a similar problem, please reply. I dont mean to make a book out of this, but im tryin to give as much info as possible. Oh and the only mods are exhaust, test pipe, and intake. Thanks for any help guys i appreciate it.