guys, i need your help. psensiya na, wala po akong alam.

what type (brand) of i/h/e would be the best for an a/t civic lxi? it's a daily driven car.

approx. how much HP would i gain from installing all these mods?

will this, in any way, have an effect sa emissions test?

for the muffler, what would you guys recommend na hindi masyado maingay during high rpm?

finally, where is the best place to get these mods installed? paki include na rin yung prices.

salamat!