any body sone a swap like this? is it an easy swap pretty much bolt in and plug-and-play or do i have to mess around with electrical like a wrx swap?

It should be a straight plug n play swap.

any good post with people who have done this, and wat about the ecu? will i need to swap that or anything?

Has anyone done this swap before? what should i take the engine out of?

99 legacy GT/Outback, look for one with replaced headgasket or (blown HG that you can replace) and least amount of piston slap. Change all the oil seals.

The only wiring you need to do is the carryover of the engine harness to the new motor. Your ecu is plenty capable of running the EJ25 with no problems.

Straight plug and play.

Jay Storm