EVO 16G, Would recommend?

[Kracka]

It also sounds like it may be your valve-seals, it is almost deffinately not your piston rings. Does your 14b have any shaft-play? The EVOIII exhaust manifold and big 16g are a good choice, but I would go with a 2.5" tubular o2 housing rather than the cast thingys since they flow better (and you won't have any fitment issues as you would with the EVOIII o2 housing).