Question [Q] L9 metro pcs to Tmobile bootloader

I just bought an L9 P679 metro pcs
at my local best buy for 99 bux
i carrier sim unlocked it so it can accept a tmobile sim chip and lock in to the network
i will plan to use it as my main phone
current android specs as follows

Android Version 4.1.2
Baseband Version L620_MODEM_SIC_01.1305.00
Kernel Version 3.0.31
Build Number JZO54K
Software Version LGMS76910e

Questions
1
when it boots you see the LG logo Followed by the metro pcs splash screen then the home screen
Changing the bootloader to Tmobile will make the METRO splash go away and instead see the Tmobile splash creen ?

2
I saw Tmobile US bootloader and Some Euro version that many people looks to love
What is the diference between the 2

3
Do i need to Unlock the bootloader to i can install CWM and the install CM10.1
or i need to root only

4
I saw a Tmobile Radio update file
do you need to apply that patch to your phone so it works better, like having better reception ? or
i just leave that alone

the method of rooting and boot unlock the L9 , seems to be more complicated than when i installed CWM and
Flashed my Samsung Exibith 4G with CM10.1

btw
altough the L9 is not a snapdragon dual core, the dual core TI chipset churns nice
i was playing with it and there is night and day speed increase between my Galaxy exibith 4g ( 1 core ) vs the L9 ( dual core )
not to say the bigger screen

but for 99 bux is the poors man Galaxy S2
Thanks for your time guys
Max.
Thanks