Dynomax! Get it from Summit for around $30. Just as good as any other. Make sure it is not leuvered. Leuvers are little vents that stick up in the path of the air. It is good for sound deadening but bad for performance. As long as you have some kind of resonator in place with the y-pipe, the sound won't be too bad. Y-pipe + no resonator = RASP. That is rice material, NO GOOD. Good luck.
