hello there, i got a bluefin for my st170 about a month ago now and im really happy with it!! mostly in 4th gear but can notice the gain in evry gear to be honest..... i did take it to be remaped but the bloke said some st170s with instal the remap and some will not..... mine is one of the ones that wouldnt exept it witch is why i turned to the bluefin! big thumbs up!.. can you post the results about the throtle body, might do the same :-D cheers