Im thinking on to buy a fast intake to my engine but i wonder
how mutch hk does it give? im going to use 427 and a f1r
is it worth to put money on it?

 

maybe 60 hp butespeed saw a boost of around that with a f1c i think

 

Oki it was a fairly good increase which size should i chose is it 102mm or less
a friend of mine have 92mm and he felt that he los engine respons with his
intake is it something wrong or is it some thing i have to tune to get right?

 

If he felt like he lost engine response that is probably due to the larger throttle body and no tune.

 

102 is supposed to handle boost better ive seen pics of 90s and 92s gettin tore up from too much boost.