anywayz, u read earlier that some say 4-1 is for high revving engine, true, this is because at higher rev those engines still can push the car so using the 4-1 extractor helps alot, if you really really want to improve pick up and screw your top end, please by all means use the 4-1 extractor, it will definately improve pick up but you would suffer at higher revs cause sadly 4g15 doesnt have VTEC or MIVEC in them so at higher revs the car wont budge. usually normal engines would use 4-21 setup cause it gives a balance for top and lower end. of course the lower end cant compare with 4-1 but it still does gives improvements compared to stock extractors la...
and bout cams, anything above 27X is considered high cams and below that is ocnsidered mild cams, also do bare in mind that the longer the duration the more prone your valves might be hitting the pistons, so do bare that in mind too... of course using ngam ngam one sure the valves wont hit la butthen this is especially more of a concern for those with high compression engines/pistons if you get what i mean...
i would hate to say this but the auto wira 1.5 gearbox really gives that engine underpoweredness... ill suggest you either change the gearbox or change the engine and the gearbox itself cause its really reallyyyyy lacking in power especially the auto... cause the ratio for the gearbox memang out, dunno why....