i got a friend who is going to bore out my b16 intake manifold, gasket and throttle body. anybody know how much to bore, or ITR measurements? If somebody has a suggestion i would appreciate it. i don't just want to bore it for the sake of boring it, i heard that you could actually harm performance if overbored, so i would like to know what most people do with their stock b16 intake manifold/ throttle body and if it's even worth doing, i got the basic header/intake/exhaust and would like to add some more power if it could be found in the stock pieces...

 

lil porting never hurts any thing id get a lil bigger TB and port match it and maybe port out the runners a lil bit to get more flo