obx might sound good at first but i garantee itll sound like ass soon.
im rocking the thermal. with a smaller header (DC 2" collector) and a cat, it sounded great. (how most street setups are)
but with a large header (SMSP 2.5" collector) and straight pipe, it sounds a little rough, lol. but thats what happens when you sacrafice sound for performace, lol.