4a inlet manifold vs 7a inlet manifold Options

[normality78]

It may sounds abit silly question but i was wondering, does anyone of you guys here did have a look into the differential of 4A and 7A inlet manifold design? I had some discussion with my fren today whom having 7A with 4A inlet head and inlet manifold, i asked him why not opt 7A inlet manifold which he said 4A inlet runner seems to be bigger hence he do think it flow better. what u guys think?

[FallenHero]

basically, there is no amount of quality porting that can be done to an economy box engine to Really increase power. If you want more power, bull the stock pistons and rods and replace with performance versions, and boost the living hell out of it. If you already have a turbo, that's your option... assuming that you are currently running in the 6-8psi range with upgraded fuel pump and FMIC.