It’s a diesel products upgraded oil cooler, in the stock location, my bad.
That looks like the OEM upgraded cooler which is simply the same cooler originally spec'd by International but with an extra row of cooling fins. Probably just sourced by Diesel Products. Either way, personally I'm not a proponent of the $2000 BPD oil cooler. It's a solution in search of a problem.
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2005 E350 RB 6.0 PSD for extended fun
1989 Landcruiser FJ62 for local fun
2011 VW TDI Golf for hwy fun