thnxs for the advice, but i sought help from ppl in the mivec nz forums,.. and most of them are using 1.6liter with this setup. well, actually most of them use 2 1/2" which is bigger than mine!.. :)
the trick is, 2 1/2" if the bent is normal bent, while 2 1/4" for mandrel bent pipes,.. I also looked into and copied ideas from b16a/b users.
another thing,.. i keep using the stock route, which sumwhat is restrictive, there is an L bend upon reaching the tank,. so there is enuff backpressure that i need.
i think that pretty much wins me over those ppl using straight pipes and big diameter.
just my experience...