hi there all just wondering if some one can help me i own a ba xr8 and i have purchased a twin throttle body and intake plenum off a fg boss 315 motor and wondering is it going to make a lot of difference to the performance or would i have to get it dyno tuned to make it work to its full potential or would i have to upgrade anything, it also revs abit higher than normal is that ok or something wrong, i also have other mods will this intake work with the others:
[*] hm headers 2 1/2'' red back exhaust
[*]25% underdrive pulley kit
[*]capa flash tuner but only the generic tunes that come with it
[*]now the twin throttle body set up

can some one tell me what sort of power in kw would i be looking at

thank you hope someone can help

It revs a bit higher....it sounds like you already have it on there? If you already have it on there can't you feel the difference? Have you dyno'd it? I would say that it's most likely to make the 260 engine more doughy down low and therefore less of a performer than it was.
Do you mean it revs past the limiter or that it idles higher?