Couple more questions? Fuel pump and map

So I am running 3rd Gen motor in my st165 with everything Idk about the fuel pump though and I am running a 2bar map sensor. My questions are: when I install my 3 Bay map sensor am I going to notice a difference immediately? Also is there any way to find out what fuel pump I have with it dropping the tank? Assuming it's stock for st165 had any one installed a walbro online 255lph instead of an intank and if so do you have to disconnect the original pump or, how does that work? Thanks in advance.

Any one?

are you running 3rd gen electronics? a pic is worth a thousand words.

you have to drop the tank. don't install an inline pump. just drop the tank and do it proper.