whats the oem cost of a 525 efi x/r package?

Don't quote me, but I would say you're looking at $42-45k at least. Plus exhaust.

Retail is I believe, 52K. However, they do not sell for that. That just gives you an idea.
Eddie

http://www.outdrives.com/Mercury_Rac...gine_Sales.asp

This site has prices for all the Mercury Engines.

525 xr, close couple, low water pickup, incl exhaust. $33,900.

[525HP with HP transom and XR Sportmaster includes headers and tailpipes i sell for 36500.00if you are using anolog gauges you will need an agi box also a new 14 pin harness and the new motor mount mounting end plates.they are additional.