Will it work

Ok all of you mustang masterminds. I have bbk equal lentgh shorty headers, x pipe(2 1/2) and mack 2 1/2 mufflers. I want to put the stock h pipe back on and eventually stock headers back on. Will the stock h pipe work with the bbk headers and the 2 1/2 inch mufflers, I mean will it bolt up without leaking. I know its an odd combo, but i am in the process of returning it to stock before i sell it.

Thanks,
Scott