Is it required or no? I have an AMS boost pill that isnt installed and i was planning on installing it with my custom tune

 

Yes, MUST be tuned. Otherwise you will over-boost like crazy; 3-ports allow much finer control of WGDC, and a lower number.

 

also if u get a grimspeed u dont use a boost pill. so u wont need it

 

What is the better option overall, Grimmspeed or Boost pill?

 

Grimmspeed for sure as long as your tuner knows how to use it correctly

 

3-port will give you a more precise adjustment and overall better tune, assuming the tuner knows what they are doing, but when switching from the OEM bleed-style of boost control to the 3-port cutoff style, tuning is a MUST! They're totally different methods of controlling boost and the car will respond differently to each.