it's true about the greddy weighing more. but would you rather have a thin sheet of metal for an exhaust or an exhaust of excellent build quality, deep sound (but not loud, fart cannish, or ricerish), and an exhaust that will last longer.
it comes down to needs of the indivisual. if you dont care about what the exhaust sounds like, or if you want a loud or possibly coffee can sound, and you arent too concerned about build quality or longevity, and wanna save some weight, then most greddy exhausts arent right for you.
AMEN my brother!! Spoken like a true, knowledgeable man!!
to fart can sounding exhausts...not saying ne thing, just giggling he he he he he