i dont know crap about cars so please bare with me.

my 01 sc2 has been driver about 20,000 miles in less then a year i do alot
of driving i know.

well as of late this loud kinda like humming noise is coming from the car,
its louder as i go faster and when i take it out of gear (manual) it still
does it. Do you think it could be i need to rotate and balance my tires or
new tires or what else could  it be

thanks

jesse