i'm pretty sure you can get a proper remap done elswhere for no more money and would get better gains though do the usual breathing mods like zorst and filter first.

i've got a 2l mk1 and the best power mod is the focus central 4-2-1 manifold which decats it aswell. along with that i've got milltek cat back and k&n pannel with uprated cold air feed and she's pumping out in the region of 145-150bhp. thats 15-20 bhp over standard and with a proper remap/live map or rolling road mapped should see the 160+ bhp mark which is pretty much same as st170 but for less money and without all the reliability issues the st170 comes with!