i say go with true duals with an x-pipe. i built mine and theyre great. the x-pipe setup has better scavenging than an H. and i built mine for half the cost of buying it or any cat back setup. and its 3 inch dumped. i have a video on you tube making a pass at the track.
https://ls1tech.com/forums/multimedi...-into-12s.htmlthis was before i had it tuned for all the work done to it. (and yes thats my wife yelling at my kid) lol