asphalt pirate

last night both of my belts poped off my car and i cant remember the size belt. it has hypertech under drive pulley, but the altenator pulley is still factory. any help here would be helpful. it sucks to have your car in the driveway and not be able to drive it! by the way im driving a 99 TA A4 mods intel power pulleys,programmer, flow master cat back,hooker headers,cold air 3.73 gears induction,k&n