oversize 1mm...
hmmm...
i dont know...
more air flow in....
more response......
hahaha......
currently im using ITR head set with BC 304 , omni power VS + retainer....
done my PnP...but jus a minor 1....
just smoothen all the runners.....
plan something diff.....
1 of my fren evo5,internal stock, oversize valve, garrett 3540, tomei cam & etc....
after install oversize valve...loads of difference..
with almost 10 CR in a turbo & boost 2 bar.....
he smoke me like a drumstick.....
that y i plan the same setup..
OS valve
haha...
if u didnt try..u wont know...
right...
btw,
u guys say that i should give up my arp???
if sell it of i can get few hundreds back..
hehe