can you weld? there is a current thread by a member named s1120 who is makin his own. yours would be easier that his too because you have the longtubes.
if you dont put a cross-over pipe in (an x pipe or h pipe) you wont get as much performance, as there will be less of a scavenging effect.
This is how mine looks right now.
i did not know much when i had this installed. It does not have a cross over. the reason the driver side bends around the tcase and above the t case skid is because there is not room on the driver side for a pipe.
The reason i suggested the y pipe into a single pipe is that with all the bends of the true duals the total length of each side is totally different.
the driver side, the one that goes around the t case, is 145 inches, with 9 approx. 90* bends, each adding the equivalent of 48 inches. thus totaling 577inches, or 48 feet.
the pass side is 120 inches with only 5 bends which totals out at 360 inches or 30 feet.
see the difference? my driver side bank is working 60% harder to push that exhaust out through the pipes.
a crossover would help equalize the two pipes
also, a single 3 inch exhaust is known to flow better.
i have flowmasters and i like them. i have heard good things about the aerochambers. i have thought about flowtech's warlock muffler as well. it has a built in cut out.