I'm no expert here,
but my understanding is tha h-pipes were pioneered
by Mopar racers back in the 70's; It was found that
balancing the flow between the downtubes on true
duals with headers increased power across the
band, especially on top. Then in the 80's,
it was discovered that if the downpipes meet
at more of a parallel angle, the balancing /scavenging
is more effective, so the x-pipe became preferred.
They also mellow the tone of duals.
Now on the SC's, most people still use a 2-into-1 resonator,
[though a lot bigger than stock] and a 3" mid-pipe
back to the back of the gas tank,
then "y"d again to dual mufflers.
This is kind of the ultimate x-pipe, IMHO,
running through a Big single pipe for 3-4 feet.
It sure mellows the V6 buzz,
and though a V8 will always sound better anyway,
i think this would be great, if you like a quiet, but
The down side is, it's heavy,
and buying 3 mufflers can get expensive,
depending on your choice of mufflers.
Check out the exhaust on SCP;
it's expensive, but can be more-or-less copied
by your local exhaust shop for a lot less.
If cost is no object, the ART system is gorgeous in stainless,
and sounds great, too.
But personally, I'd throw a 2-n-2 bassani resonator in it,
instead of the x-pipe, for a mellower tone.
Geez, look how i'm ranting on,
as if i don't need to get to work here.
Good luck with your exhaust.