The MAC set-up is still fairly new, which is primarily why there aren't really any videos. AmericanMuscle doesn't carry them, but ARH has a set of longtubes with the option for an h-pipe: ARH Longtubes Headers & Off Road H-pipe
. Kinda high in price but they've always been top quality products from what I've seen. You could also get a custom one fabricated. I had a shop make one for my Borla headers using the Lethal Performance off road h-pipe I had.
2012 Kona Blue 3.7L V6:
Borla LT headers, O/R h-pipe, Borla S-types, 3.73 gears,
Steeda adjustable UCA w/ mount, BMR LCAs, Airaid CAI,
LCA Relocation brackets, AE driveshaft, GT 80mm TB,
Black 18x9/10 2010 GT500 Wheels w/ Nitto NT555s,
Eibach Sportline Springs/shocks & Koni STR.T Struts