I bet you are going to pay alot unless you can find a wrecked H6. You would be better of having one custom made to match.
Price for OEM 95-99 2.5 exhaust
CC-w/o Calif. emissions-$515.98, w/Calif. emissions-$559.48
Total- w/o Calif. emissions-$1,160.51
No telling how much they want for the H6 stuff.