Hi peeps I'm new on here so first off hi!!!

I am going to be doing some upgrades to my focus rs mk1, I have done the norm bluefin, decat, gen2 Front mount. I am wanting to upgrade my turbo so I have a t3 equal length manifold with turbosmart ext waste gate, if I go for a gtx3071r will I need to get a remap before I can drive the car?? I am going to save up and get steel rods and pistons plus a jenvey plenum but wanted to fit the manifold and turbo first.

And help would be great!