I think in the interest of clarity, it should be pointed out that for some strange reason you are putting off having a van that sounds like that.
And you could do true duals on the van with some cheap ebay Gran Prix headers reflanged to 3.0 style
11.5 was on a quiet stock heads cams shortblock ecu paper headgasket 8.9:1 3.0 from a minivan.
BTW, anyone who ever thought the 1996+ caravans came with a 9.3:1 motor...I disagree. The piston dish looks exactly the same as the 8.9. WTF chrysler?