I have a remus race. Have heard others..... I don't know why others rave so much about Gintani on the board, its just loud, and not refined.
My remus race has a deep exhaust note, unheard in other systems. I thought about an x-pipe. But it was just a thought, the remus race is loud enough, and paired up with an x-pipe you will be heard from 5 blocks away.
Go with Remus! The sound is intoxicating, and you just cant beat the price.