it can be fixed, all stock style TOB's need to be replaced w/ aftermarket ones or they will rattle, i just replaced my clutch w/ a factory like one, and it STILL RATTLES everyonce in a while, it only gets louder and more annoying, but a Spec stage 2 or any other higher performance aftermarket clutch will not make the noise, so if your modding it, you'll be cool<< when you do replace the clutch, i recommend the spec alum. flywheel too, its awesome
as for the sunroof, it only gets worse, there is a factory replacement of a newer design (you'd have to ask for it) , if you can get it, the older style rails will always shudder, so get them to replace that while you can!!!!
i dont' think there is anything else, but those GTS spyders are AWESOME!!!