Fastest baud rate w/PBP?

So I suddenly need to go faster than 38,400 with a PIC16F883 and a 20 MHz xtal. I'm sending out on 4 pins, with no MAX232 chips involved. The good book says a max of 38,400, but haven't I seen postings that say (up to)115,300???.. Do I need to write a routine in assembler to do this?
Thanks for listening,
JR