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Most if not all longtube headers have a mid pipe specifically designed for their particualar setup ARH has recently offered a H-pipe to go with there L/Ts. Other than them JBA also offers a L/TH-pipe setup.
ARH>JBA but JBA isn't too bad either for the price.
MRT offers a catted H-pipe in T-304 and T-409 SS. The only advantage with those are high flow cats and a 2.5" crossover. Not worth the $445-$499 you'll pay for them though IMO.